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Civilization 1 Advances

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  • Civilization 1 Advances

    C I V I L I Z A T I O N    A D V A N C E S
       Cross Reference
    
    
    <- = prerequisites, listed in reverse chronological order
    -> = successors, listed in forward chronological order
    
    
    ADVANCES
    --------
    
    Alphabet-> Writing, MapMaking, Code of Laws, Mathematics, 
     Diplomat, Library, Trireme, Lighthouse, Courthouse, 
     Literacy, Monarchy, Trade, Catapult, Astronomy, 
     Great Library, Republic, Philosophy, Feudalism, 
     Caravan, Copernicus, Navigation, Banking, Medicine, 
     Religion, Democracy, University, Chivalry, 
     Invention, Sail, Magellan, Physics, Bank, 
     Shakespeare, Cathedral, J.S. Bach, Michelangelo, 
     Chemistry, University (Imp), Theory of Gravity, 
     Knight, Gunpowder, Magnetism, Steam Engine, 
     Isaac Newton, Atomic Theory, Explosives, Musketeer, 
     Metallurgy, Frigate, Railroad, Ironclad, 
     Conscription, Cannon, Electricity, Darwin's Voyage, 
     Industrialization, Rifleman, Electronics, Transport, 
     Factory, Women's Suffrage, Steel, Corporation, 
     Communism, Hydro Plant, Hoover Dam, Computers, 
     Battleship, Refining, Genetic Eng., United Nations, 
     SETI Program, Power Plant, Combustion, 
     Cure for Cancer, Automobile, Cruiser, Flight, Armor, 
     Mass Production, Fighter, Advanced Flight, 
     Labor Union, Submarine, Mass Transit, Recycling, 
     Nuclear Fission, Bomber, Carrier, Rocketry, 
     Mech Infantry, Recycling Center, Manhattan Project, 
     Nuclear Power, Nuclear Unit, Space Flight, 
     Nuclear Plant, SS Structure, Apollo Program, 
     Plastic, SS Component, Superconductor, Robotics, 
     Fusion Power, SDI Defence, Artillery, Mfg Plant, 
     SS Module
    Bronze Working    -> Iron Working, Currency, Legion, Marketplace, Trade, 
     Construction, Caravan, Aqueduct, Colosseum, 
     Fortress, Engineering, Bridge Building, Banking, 
     Medicine, Invention, Bank, Shakespeare, Chemistry, 
     Gunpowder, Steam Engine, Explosives, Musketeer, 
     Metallurgy, Railroad, Ironclad, Conscription, 
     Cannon, Electricity, Darwin's Voyage, 
     Industrialization, Rifleman, Electronics, Transport, 
     Factory, Women's Suffrage, Steel, Corporation, 
     Communism, Hydro Plant, Hoover Dam, Computers, 
     Battleship, Refining, Genetic Eng., United Nations, 
     SETI Program, Power Plant, Combustion, 
     Cure for Cancer, Automobile, Cruiser, Flight, Armor, 
     Mass Production, Fighter, Advanced Flight, 
     Labor Union, Submarine, Mass Transit, Recycling, 
     Nuclear Fission, Bomber, Carrier, Rocketry, 
     Mech Infantry, Recycling Center, Manhattan Project, 
     Nuclear Power, Nuclear Unit, Space Flight, 
     Nuclear Plant, SS Structure, Apollo Program, 
     Plastic, SS Component, Superconductor, Robotics, 
     Fusion Power, SDI Defence, Artillery, Mfg Plant, 
     SS Module
    
    Ceremonial Burial -> Temple, Mysticism, Monarchy, Oracle, Astronomy, 
     Philosophy, Feudalism, Copernicus, Navigation, 
     Medicine, Religion, Democracy, University, Chivalry, 
     Sail, Magellan, Physics, Shakespeare, Cathedral, 
     J.S. Bach, Michelangelo, Chemistry, 
     University (Imp), Theory of Gravity, Knight, 
     Magnetism, Steam Engine, Isaac Newton, 
     Atomic Theory, Explosives, Metallurgy, Frigate, 
     Railroad, Ironclad, Conscription, Cannon, 
     Electricity, Darwin's Voyage, Industrialization, 
     Rifleman, Electronics, Transport, Factory, 
     Women's Suffrage, Steel, Corporation, Communism, 
     Hydro Plant, Hoover Dam, Computers, Battleship, 
     Refining, Genetic Eng., United Nations, 
     SETI Program, Power Plant, Combustion, 
     Cure for Cancer, Automobile, Cruiser, Flight, Armor, 
     Mass Production, Fighter, Advanced Flight, 
     Labor Union, Submarine, Mass Transit, Recycling, 
     Nuclear Fission, Bomber, Carrier, Rocketry, 
     Mech Infantry, Recycling Center, Manhattan Project, 
     Nuclear Power, Nuclear Unit, Space Flight, 
     Nuclear Plant, SS Structure, Apollo Program, 
     Plastic, SS Component, Superconductor, Robotics, 
     Fusion Power, SDI Defence, Artillery, Mfg Plant, 
     SS Module
    
    Masonry -> Palace, City Wall, Pyramids, Great Wall, 
     Mathematics, Construction, Catapult, Astronomy, 
     Feudalism, Aqueduct, Colosseum, Fortress, 
     Engineering, Bridge Building, Copernicus, 
     Navigation, University, Chivalry, Invention, Sail, 
     Magellan, Physics, Chemistry, University (Imp), 
     Theory of Gravity, Knight, Gunpowder, Magnetism, 
     Steam Engine, Isaac Newton, Atomic Theory, 
     Explosives, Musketeer, Metallurgy, Frigate, 
     Railroad, Ironclad, Conscription, Cannon, 
     Electricity, Darwin's Voyage, Industrialization, 
     Rifleman, Electronics, Transport, Factory, 
     Women's Suffrage, Steel, Corporation, Communism, 
     Hydro Plant, Hoover Dam, Computers, Battleship, 
     Refining, Genetic Eng., United Nations, 
     SETI Program, Power Plant, Combustion, 
     Cure for Cancer, Automobile, Cruiser, Flight, Armor, 
     Mass Production, Fighter, Advanced Flight, 
     Labor Union, Submarine, Mass Transit, Recycling, 
     Nuclear Fission, Bomber, Carrier, Rocketry, 
     Mech Infantry, Recycling Center, Manhattan Project, 
     Nuclear Power, Nuclear Unit, Space Flight, 
     Nuclear Plant, SS Structure, Apollo Program, 
     Plastic, SS Component, Superconductor, Robotics, 
     Fusion Power, SDI Defence, Artillery, Mfg Plant, 
     SS Module
    
    The Wheel    -> Chariot, Engineering, Invention, Gunpowder, 
     Steam Engine, Explosives, Musketeer, Metallurgy, 
     Railroad, Ironclad, Conscription, Cannon, 
     Electricity, Darwin's Voyage, Industrialization, 
     Rifleman, Electronics, Transport, Factory, 
     Women's Suffrage, Steel, Corporation, Communism, 
     Hydro Plant, Hoover Dam, Computers, Battleship, 
     Refining, Genetic Eng., United Nations, 
     SETI Program, Power Plant, Combustion, 
     Cure for Cancer, Automobile, Cruiser, Flight, Armor, 
     Mass Production, Fighter, Advanced Flight, 
     Labor Union, Submarine, Mass Transit, Recycling, 
     Nuclear Fission, Bomber, Carrier, Rocketry, 
     Mech Infantry, Recycling Center, Manhattan Project, 
     Nuclear Power, Nuclear Unit, Space Flight, 
     Nuclear Plant, SS Structure, Apollo Program, 
     Plastic, SS Component, Superconductor, Robotics, 
     Fusion Power, SDI Defence, Artillery, Mfg Plant, 
     SS Module
    
    Horseback Riding  -> Cavalry, Chivalry, Knight
    
    Pottery -> Granary, Hanging Garden
    
    Map Making   -> Navigation, Sail, Magellan, Physics, Magnetism, 
     Steam Engine, Atomic Theory, Frigate, Railroad, 
     Ironclad, Electricity, Darwin's Voyage, 
     Industrialization, Electronics, Transport, Factory, 
     Women's Suffrage, Steel, Corporation, Communism, 
     Hydro Plant, Hoover Dam, Computers, Battleship, 
     Refining, Genetic Eng., United Nations, 
     SETI Program, Power Plant, Combustion, 
     Cure for Cancer, Automobile, Cruiser, Flight, Armor, 
     Mass Production, Fighter, Advanced Flight, 
     Labor Union, Submarine, Mass Transit, Recycling, 
     Nuclear Fission, Bomber, Carrier, Rocketry, 
     Mech Infantry, Recycling Center, Manhattan Project, 
     Nuclear Power, Nuclear Unit, Space Flight, 
     Nuclear Plant, SS Structure, Apollo Program, 
     Plastic, SS Component, Superconductor, Robotics, 
     Fusion Power, SDI Defence, Artillery, Mfg Plant, 
     SS Module
    
    Writing <- Alphabet
    
       -> Diplomat, Library, Literacy, Great Library, 
     Republic, Philosophy, Banking, Medicine, Religion, 
     Democracy, University, Invention, Bank, Shakespeare, 
     Cathedral, J.S. Bach, Michelangelo, Chemistry, 
     University (Imp), Theory of Gravity, Gunpowder, 
     Steam Engine, Isaac Newton, Atomic Theory, 
     Explosives, Musketeer, Metallurgy, Railroad, 
     Ironclad, Conscription, Cannon, Electricity, 
     Darwin's Voyage, Industrialization, Rifleman, 
     Electronics, Transport, Factory, Women's Suffrage, 
     Steel, Corporation, Communism, Hydro Plant, 
     Hoover Dam, Computers, Battleship, Refining, 
     Genetic Eng., United Nations, SETI Program, 
     Power Plant, Combustion, Cure for Cancer, 
     Automobile, Cruiser, Flight, Armor, Mass Production, 
     Fighter, Advanced Flight, Labor Union, Submarine, 
     Mass Transit, Recycling, Nuclear Fission, Bomber, 
     Carrier, Rocketry, Mech Infantry, Recycling Center, 
     Manhattan Project, Nuclear Power, Nuclear Unit, 
     Space Flight, Nuclear Plant, SS Structure, 
     Apollo Program, Plastic, SS Component, 
     Superconductor, Robotics, Fusion Power, SDI Defence, 
     Artillery, Mfg Plant, SS Module
    
    MapMaking    <- Alphabet
    
       -> Trireme, Lighthouse
    
    Code of Laws <- Alphabet
    
       -> Courthouse, Literacy, Monarchy, Trade, 
     Great Library, Republic, Philosophy, Feudalism, 
     Caravan, Banking, Medicine, Religion, Democracy, 
     University, Chivalry, Invention, Bank, Shakespeare, 
     Cathedral, J.S. Bach, Michelangelo, Chemistry, 
     University (Imp), Theory of Gravity, Knight, 
     Gunpowder, Steam Engine, Isaac Newton, 
     Atomic Theory, Explosives, Musketeer, Metallurgy, 
     Railroad, Ironclad, Conscription, Cannon, 
     Electricity, Darwin's Voyage, Industrialization, 
     Rifleman, Electronics, Transport, Factory, 
     Women's Suffrage, Steel, Corporation, Communism, 
     Hydro Plant, Hoover Dam, Computers, Battleship, 
     Refining, Genetic Eng., United Nations, 
     SETI Program, Power Plant, Combustion, 
     Cure for Cancer, Automobile, Cruiser, Flight, Armor, 
     Mass Production, Fighter, Advanced Flight, 
     Labor Union, Submarine, Mass Transit, Recycling, 
     Nuclear Fission, Bomber, Carrier, Rocketry, 
     Mech Infantry, Recycling Center, Manhattan Project, 
     Nuclear Power, Nuclear Unit, Space Flight, 
     Nuclear Plant, SS Structure, Apollo Program, 
     Plastic, SS Component, Superconductor, Robotics, 
     Fusion Power, SDI Defence, Artillery, Mfg Plant, 
     SS Module
    
    Iron Working <- Bronze Working
    
       -> Legion, Bridge Building, Gunpowder, Explosives, 
     Musketeer, Metallurgy, Railroad, Conscription, 
     Cannon, Electricity, Darwin's Voyage, 
     Industrialization, Rifleman, Electronics, Transport, 
     Factory, Women's Suffrage, Steel, Corporation, 
     Communism, Hydro Plant, Hoover Dam, Computers, 
     Battleship, Refining, Genetic Eng., United Nations, 
     SETI Program, Power Plant, Combustion, 
     Cure for Cancer, Automobile, Cruiser, Flight, Armor, 
     Mass Production, Fighter, Advanced Flight, 
     Labor Union, Submarine, Mass Transit, Recycling, 
     Nuclear Fission, Bomber, Carrier, Rocketry, 
     Mech Infantry, Recycling Center, Manhattan Project, 
     Nuclear Power, Nuclear Unit, Space Flight, 
     Nuclear Plant, SS Structure, Apollo Program, 
     Plastic, SS Component, Superconductor, Robotics, 
     Fusion Power, SDI Defence, Artillery, Mfg Plant, 
     SS Module
    
    Currency<- Bronze Working
    
       -> Marketplace, Trade, Construction, Caravan, Aqueduct, 
     Colosseum, Fortress, Engineering, Bridge Building, 
     Banking, Medicine, Invention, Bank, Shakespeare, 
     Chemistry, Gunpowder, Steam Engine, Explosives, 
     Musketeer, Metallurgy, Railroad, Ironclad, 
     Conscription, Cannon, Electricity, Darwin's Voyage, 
     Industrialization, Rifleman, Electronics, Transport, 
     Factory, Women's Suffrage, Steel, Corporation, 
     Communism, Hydro Plant, Hoover Dam, Computers, 
     Battleship, Refining, Genetic Eng., United Nations, 
     SETI Program, Power Plant, Combustion, 
     Cure for Cancer, Automobile, Cruiser, Flight, Armor, 
     Mass Production, Fighter, Advanced Flight, 
     Labor Union, Submarine, Mass Transit, Recycling, 
     Nuclear Fission, Bomber, Carrier, Rocketry, 
     Mech Infantry, Recycling Center, Manhattan Project, 
     Nuclear Power, Nuclear Unit, Space Flight, 
     Nuclear Plant, SS Structure, Apollo Program, 
     Plastic, SS Component, Superconductor, Robotics, 
     Fusion Power, SDI Defence, Artillery, Mfg Plant, 
     SS Module
    
    Mysticism    <- Ceremonial Burial
    
       -> Oracle, Astronomy, Philosophy, Copernicus, 
     Navigation, Medicine, Religion, Democracy, 
     University, Sail, Magellan, Physics, Shakespeare, 
     Cathedral, J.S. Bach, Michelangelo, Chemistry, 
     University (Imp), Theory of Gravity, Magnetism, 
     Steam Engine, Isaac Newton, Atomic Theory, 
     Explosives, Metallurgy, Frigate, Railroad, Ironclad, 
     Conscription, Cannon, Electricity, Darwin's Voyage, 
     Industrialization, Rifleman, Electronics, Transport, 
     Factory, Women's Suffrage, Steel, Corporation, 
     Communism, Hydro Plant, Hoover Dam, Computers, 
     Battleship, Refining, Genetic Eng., United Nations, 
     SETI Program, Power Plant, Combustion, 
     Cure for Cancer, Automobile, Cruiser, Flight, Armor, 
     Mass Production, Fighter, Advanced Flight, 
     Labor Union, Submarine, Mass Transit, Recycling, 
     Nuclear Fission, Bomber, Carrier, Rocketry, 
     Mech Infantry, Recycling Center, Manhattan Project, 
     Nuclear Power, Nuclear Unit, Space Flight, 
     Nuclear Plant, SS Structure, Apollo Program, 
     Plastic, SS Component, Superconductor, Robotics, 
     Fusion Power, SDI Defence, Artillery, Mfg Plant, 
     SS Module
    
    Mathematics  <- Masonry, Alphabet
    
       -> Catapult, Astronomy, Copernicus, Navigation, 
     University, Sail, Magellan, Physics, Chemistry, 
     University (Imp), Theory of Gravity, Magnetism, 
     Steam Engine, Isaac Newton, Atomic Theory, 
     Explosives, Metallurgy, Frigate, Railroad, Ironclad, 
     Conscription, Cannon, Electricity, Darwin's Voyage, 
     Industrialization, Rifleman, Electronics, Transport, 
     Factory, Women's Suffrage, Steel, Corporation, 
     Communism, Hydro Plant, Hoover Dam, Computers, 
     Battleship, Refining, Genetic Eng., United Nations, 
     SETI Program, Power Plant, Combustion, 
     Cure for Cancer, Automobile, Cruiser, Flight, Armor, 
     Mass Production, Fighter, Advanced Flight, 
     Labor Union, Submarine, Mass Transit, Recycling, 
     Nuclear Fission, Bomber, Carrier, Rocketry, 
     Mech Infantry, Recycling Center, Manhattan Project, 
     Nuclear Power, Nuclear Unit, Space Flight, 
     Nuclear Plant, SS Structure, Apollo Program, 
     Plastic, SS Component, Superconductor, Robotics, 
     Fusion Power, SDI Defence, Artillery, Mfg Plant, 
     SS Module
    
    Literacy<- Code of Laws, Writing, Alphabet
    
       -> Great Library, Republic, Philosophy, Banking, 
     Medicine, Religion, Democracy, University, 
     Invention, Bank, Shakespeare, Cathedral, J.S. Bach, 
     Michelangelo, Chemistry, University (Imp), 
     Theory of Gravity, Gunpowder, Steam Engine, 
     Isaac Newton, Atomic Theory, Explosives, Musketeer, 
     Metallurgy, Railroad, Ironclad, Conscription, 
     Cannon, Electricity, Darwin's Voyage, 
     Industrialization, Rifleman, Electronics, Transport, 
     Factory, Women's Suffrage, Steel, Corporation, 
     Communism, Hydro Plant, Hoover Dam, Computers, 
     Battleship, Refining, Genetic Eng., United Nations, 
     SETI Program, Power Plant, Combustion, 
     Cure for Cancer, Automobile, Cruiser, Flight, Armor, 
     Mass Production, Fighter, Advanced Flight, 
     Labor Union, Submarine, Mass Transit, Recycling, 
     Nuclear Fission, Bomber, Carrier, Rocketry, 
     Mech Infantry, Recycling Center, Manhattan Project, 
     Nuclear Power, Nuclear Unit, Space Flight, 
     Nuclear Plant, SS Structure, Apollo Program, 
     Plastic, SS Component, Superconductor, Robotics, 
     Fusion Power, SDI Defence, Artillery, Mfg Plant, 
     SS Module
    
    Monarchy<- Code of Laws, Ceremonial Burial, Alphabet
    
       -> Feudalism, Chivalry, Knight
    
    Trade   <- Currency, Code of Laws, Bronze Working, Alphabet
    
       -> Caravan, Banking, Medicine, Bank, Shakespeare, 
     Chemistry, Explosives, Conscription, 
     Industrialization, Rifleman, Transport, Factory, 
     Women's Suffrage, Steel, Corporation, Communism, 
     Battleship, Refining, Genetic Eng., United Nations, 
     Power Plant, Combustion, Cure for Cancer, 
     Automobile, Cruiser, Flight, Armor, Mass Production, 
     Fighter, Advanced Flight, Labor Union, Submarine, 
     Mass Transit, Recycling, Nuclear Fission, Bomber, 
     Carrier, Rocketry, Mech Infantry, Recycling Center, 
     Manhattan Project, Nuclear Power, Nuclear Unit, 
     Space Flight, Nuclear Plant, SS Structure, 
     Apollo Program, Plastic, SS Component, 
     Superconductor, Robotics, Fusion Power, SDI Defence, 
     Artillery, Mfg Plant, SS Module
    
    Construction <- Currency, Masonry, Bronze Working
    
       -> Aqueduct, Colosseum, Fortress, Engineering, 
     Bridge Building, Invention, Gunpowder, Steam Engine, 
     Explosives, Musketeer, Metallurgy, Railroad, 
     Ironclad, Conscription, Cannon, Electricity, 
     Darwin's Voyage, Industrialization, Rifleman, 
     Electronics, Transport, Factory, Women's Suffrage, 
     Steel, Corporation, Communism, Hydro Plant, 
     Hoover Dam, Computers, Battleship, Refining, 
     Genetic Eng., United Nations, SETI Program, 
     Power Plant, Combustion, Cure for Cancer, 
     Automobile, Cruiser, Flight, Armor, Mass Production, 
     Fighter, Advanced Flight, Labor Union, Submarine, 
     Mass Transit, Recycling, Nuclear Fission, Bomber, 
     Carrier, Rocketry, Mech Infantry, Recycling Center, 
     Manhattan Project, Nuclear Power, Nuclear Unit, 
     Space Flight, Nuclear Plant, SS Structure, 
     Apollo Program, Plastic, SS Component, 
     Superconductor, Robotics, Fusion Power, SDI Defence, 
     Artillery, Mfg Plant, SS Module
    
    Astronomy    <- Mathematics, Mysticism, Masonry, Ceremonial Burial, 
     Alphabet
    
       -> Copernicus, Navigation, Sail, Magellan, Physics, 
     Theory of Gravity, Magnetism, Steam Engine, 
     Isaac Newton, Atomic Theory, Frigate, Railroad, 
     Ironclad, Electricity, Darwin's Voyage, 
     Industrialization, Electronics, Transport, Factory, 
     Women's Suffrage, Steel, Corporation, Communism, 
     Hydro Plant, Hoover Dam, Computers, Battleship, 
     Refining, Genetic Eng., United Nations, 
     SETI Program, Power Plant, Combustion, 
     Cure for Cancer, Automobile, Cruiser, Flight, Armor, 
     Mass Production, Fighter, Advanced Flight, 
     Labor Union, Submarine, Mass Transit, Recycling, 
     Nuclear Fission, Bomber, Carrier, Rocketry, 
     Mech Infantry, Recycling Center, Manhattan Project, 
     Nuclear Power, Nuclear Unit, Space Flight, 
     Nuclear Plant, SS Structure, Apollo Program, 
     Plastic, SS Component, Superconductor, Robotics, 
     Fusion Power, SDI Defence, Artillery, Mfg Plant, 
     SS Module
    
    Republic<- Literacy, Code of Laws, Writing, Alphabet
    
       -> Banking, Bank, Conscription, Industrialization, 
     Rifleman, Transport, Factory, Women's Suffrage, 
     Steel, Corporation, Communism, Battleship, Refining, 
     Genetic Eng., United Nations, Power Plant, 
     Combustion, Cure for Cancer, Automobile, Cruiser, 
     Flight, Armor, Mass Production, Fighter, 
     Advanced Flight, Labor Union, Submarine, 
     Mass Transit, Recycling, Nuclear Fission, Bomber, 
     Carrier, Rocketry, Mech Infantry, Recycling Center, 
     Manhattan Project, Nuclear Power, Nuclear Unit, 
     Space Flight, Nuclear Plant, SS Structure, 
     Apollo Program, Plastic, SS Component, 
     Superconductor, Robotics, Fusion Power, SDI Defence, 
     Artillery, Mfg Plant, SS Module
    
    Philosophy   <- Literacy, Mysticism, Code of Laws, Writing, 
     Ceremonial Burial, Alphabet
    
       -> Medicine, Religion, Democracy, University, 
     Shakespeare, Cathedral, J.S. Bach, Michelangelo, 
     Chemistry, University (Imp), Theory of Gravity, 
     Isaac Newton, Atomic Theory, Explosives, Metallurgy, 
     Conscription, Cannon, Electricity, Rifleman, 
     Electronics, Steel, Communism, Hydro Plant, 
     Hoover Dam, Computers, Battleship, Refining, 
     Genetic Eng., United Nations, SETI Program, 
     Power Plant, Combustion, Cure for Cancer, 
     Automobile, Cruiser, Flight, Armor, Mass Production, 
     Fighter, Advanced Flight, Labor Union, Submarine, 
     Mass Transit, Recycling, Nuclear Fission, Bomber, 
     Carrier, Rocketry, Mech Infantry, Recycling Center, 
     Manhattan Project, Nuclear Power, Nuclear Unit, 
     Space Flight, Nuclear Plant, SS Structure, 
     Apollo Program, Plastic, SS Component, 
     Superconductor, Robotics, Fusion Power, SDI Defence, 
     Artillery, Mfg Plant, SS Module
    
    Feudalism    <- Monarchy, Code of Laws, Masonry, Ceremonial Burial, 
     Alphabet
    
       -> Chivalry, Knight
    
    Engineering  <- Construction, Currency, The Wheel, Masonry, 
     Bronze Working
    
       -> Invention, Gunpowder, Steam Engine, Explosives, 
     Musketeer, Metallurgy, Railroad, Ironclad, 
     Conscription, Cannon, Electricity, Darwin's Voyage, 
     Industrialization, Rifleman, Electronics, Transport, 
     Factory, Women's Suffrage, Steel, Corporation, 
     Communism, Hydro Plant, Hoover Dam, Computers, 
     Battleship, Refining, Genetic Eng., United Nations, 
     SETI Program, Power Plant, Combustion, 
     Cure for Cancer, Automobile, Cruiser, Flight, Armor, 
     Mass Production, Fighter, Advanced Flight, 
     Labor Union, Submarine, Mass Transit, Recycling, 
     Nuclear Fission, Bomber, Carrier, Rocketry, 
     Mech Infantry, Recycling Center, Manhattan Project, 
     Nuclear Power, Nuclear Unit, Space Flight, 
     Nuclear Plant, SS Structure, Apollo Program, 
     Plastic, SS Component, Superconductor, Robotics, 
     Fusion Power, SDI Defence, Artillery, Mfg Plant, 
     SS Module
    
    Bridge Building   <- Construction, Currency, Iron Working, Masonry, 
     Bronze Working
    
       -> Railroad, Darwin's Voyage, Industrialization, 
     Transport, Factory, Women's Suffrage, Steel, 
     Corporation, Communism, Battleship, Refining, 
     Genetic Eng., United Nations, Power Plant, 
     Combustion, Cure for Cancer, Automobile, Cruiser, 
     Flight, Armor, Mass Production, Fighter, 
     Advanced Flight, Labor Union, Submarine, 
     Mass Transit, Recycling, Nuclear Fission, Bomber, 
     Carrier, Rocketry, Mech Infantry, Recycling Center, 
     Manhattan Project, Nuclear Power, Nuclear Unit, 
     Space Flight, Nuclear Plant, SS Structure, 
     Apollo Program, Plastic, SS Component, 
     Superconductor, Robotics, Fusion Power, SDI Defence, 
     Artillery, Mfg Plant, SS Module
    
    Navigation   <- Astronomy, Mathematics, Mysticism, Map Making, 
     Masonry, Ceremonial Burial, Alphabet
    
       -> Sail, Magellan, Physics, Magnetism, Steam Engine, 
     Atomic Theory, Frigate, Railroad, Ironclad, 
     Electricity, Darwin's Voyage, Industrialization, 
     Electronics, Transport, Factory, Women's Suffrage, 
     Steel, Corporation, Communism, Hydro Plant, 
     Hoover Dam, Computers, Battleship, Refining, 
     Genetic Eng., United Nations, SETI Program, 
     Power Plant, Combustion, Cure for Cancer, 
     Automobile, Cruiser, Flight, Armor, Mass Production, 
     Fighter, Advanced Flight, Labor Union, Submarine, 
     Mass Transit, Recycling, Nuclear Fission, Bomber, 
     Carrier, Rocketry, Mech Infantry, Recycling Center, 
     Manhattan Project, Nuclear Power, Nuclear Unit, 
     Space Flight, Nuclear Plant, SS Structure, 
     Apollo Program, Plastic, SS Component, 
     Superconductor, Robotics, Fusion Power, SDI Defence, 
     Artillery, Mfg Plant, SS Module
    
    Banking <- Republic, Trade, Literacy, Currency, Code of Laws, 
     Writing, Bronze Working, Alphabet
    
       -> Bank, Industrialization, Transport, Factory, 
     Women's Suffrage, Steel, Corporation, Communism, 
     Battleship, Refining, Genetic Eng., United Nations, 
     Power Plant, Combustion, Cure for Cancer, 
     Automobile, Cruiser, Flight, Armor, Mass Production, 
     Fighter, Advanced Flight, Labor Union, Submarine, 
     Mass Transit, Recycling, Nuclear Fission, Bomber, 
     Carrier, Rocketry, Mech Infantry, Recycling Center, 
     Manhattan Project, Nuclear Power, Nuclear Unit, 
     Space Flight, Nuclear Plant, SS Structure, 
     Apollo Program, Plastic, SS Component, 
     Superconductor, Robotics, Fusion Power, SDI Defence, 
     Artillery, Mfg Plant, SS Module
    
    Medicine<- Philosophy, Trade, Literacy, Mysticism, Currency, 
     Code of Laws, Writing, Ceremonial Burial, 
     Bronze Working, Alphabet
    
       -> Shakespeare, Chemistry, Explosives, Conscription, 
     Rifleman, Refining, Genetic Eng., Power Plant, 
     Combustion, Cure for Cancer, Automobile, Cruiser, 
     Flight, Armor, Mass Production, Fighter, 
     Advanced Flight, Labor Union, Submarine, 
     Mass Transit, Recycling, Nuclear Fission, Bomber, 
     Carrier, Rocketry, Mech Infantry, Recycling Center, 
     Manhattan Project, Nuclear Power, Nuclear Unit, 
     Space Flight, Nuclear Plant, SS Structure, 
     Apollo Program, Plastic, SS Component, 
     Superconductor, Robotics, Fusion Power, SDI Defence, 
     Artillery, Mfg Plant, SS Module
    
    Religion<- Philosophy, Literacy, Mysticism, Code of Laws, 
     Writing, Ceremonial Burial, Alphabet
    
       -> Cathedral, J.S. Bach, Michelangelo
    
    Democracy    <- Philosophy, Literacy, Mysticism, Code of Laws, 
     Writing, Ceremonial Burial, Alphabet
    
       -> Recycling, Recycling Center
    
    University   <- Philosophy, Literacy, Mathematics, Mysticism, 
     Code of Laws, Writing, Masonry, Ceremonial Burial, 
     Alphabet
    
       -> Chemistry, University (Imp), Theory of Gravity, 
     Isaac Newton, Atomic Theory, Explosives, Metallurgy, 
     Conscription, Cannon, Electricity, Rifleman, 
     Electronics, Steel, Hydro Plant, Hoover Dam, 
     Computers, Battleship, Refining, SETI Program, 
     Power Plant, Combustion, Automobile, Cruiser, 
     Flight, Armor, Mass Production, Fighter, 
     Advanced Flight, Labor Union, Submarine, 
     Mass Transit, Recycling, Nuclear Fission, Bomber, 
     Carrier, Rocketry, Mech Infantry, Recycling Center, 
     Manhattan Project, Nuclear Power, Nuclear Unit, 
     Space Flight, Nuclear Plant, SS Structure, 
     Apollo Program, Plastic, SS Component, 
     Superconductor, Robotics, Fusion Power, SDI Defence, 
     Artillery, Mfg Plant, SS Module
    
    Chivalry<- Feudalism, Monarchy, Code of Laws, Horseback Riding, 
     Masonry, Ceremonial Burial, Alphabet
    
       -> Knight
    
    Invention    <- Engineering, Construction, Literacy, Currency, 
     Code of Laws, Writing, The Wheel, Masonry, 
     Bronze Working, Alphabet
    
       -> Gunpowder, Steam Engine, Explosives, Musketeer, 
     Metallurgy, Railroad, Ironclad, Conscription, 
     Cannon, Electricity, Darwin's Voyage, 
     Industrialization, Rifleman, Electronics, Transport, 
     Factory, Women's Suffrage, Steel, Corporation, 
     Communism, Hydro Plant, Hoover Dam, Computers, 
     Battleship, Refining, Genetic Eng., United Nations, 
     SETI Program, Power Plant, Combustion, 
     Cure for Cancer, Automobile, Cruiser, Flight, Armor, 
     Mass Production, Fighter, Advanced Flight, 
     Labor Union, Submarine, Mass Transit, Recycling, 
     Nuclear Fission, Bomber, Carrier, Rocketry, 
     Mech Infantry, Recycling Center, Manhattan Project, 
     Nuclear Power, Nuclear Unit, Space Flight, 
     Nuclear Plant, SS Structure, Apollo Program, 
     Plastic, SS Component, Superconductor, Robotics, 
     Fusion Power, SDI Defence, Artillery, Mfg Plant, 
     SS Module
    
    Physics <- Navigation, Astronomy, Mathematics, Mysticism, 
     Map Making, Masonry, Ceremonial Burial, Alphabet
    
       -> Magnetism, Steam Engine, Atomic Theory, Frigate, 
     Railroad, Ironclad, Electricity, Darwin's Voyage, 
     Industrialization, Electronics, Transport, Factory, 
     Women's Suffrage, Steel, Corporation, Communism, 
     Hydro Plant, Hoover Dam, Computers, Battleship, 
     Refining, Genetic Eng., United Nations, 
     SETI Program, Power Plant, Combustion, 
     Cure for Cancer, Automobile, Cruiser, Flight, Armor, 
     Mass Production, Fighter, Advanced Flight, 
     Labor Union, Submarine, Mass Transit, Recycling, 
     Nuclear Fission, Bomber, Carrier, Rocketry, 
     Mech Infantry, Recycling Center, Manhattan Project, 
     Nuclear Power, Nuclear Unit, Space Flight, 
     Nuclear Plant, SS Structure, Apollo Program, 
     Plastic, SS Component, Superconductor, Robotics, 
     Fusion Power, SDI Defence, Artillery, Mfg Plant, 
     SS Module
    
    Chemistry    <- University, Medicine, Philosophy, Trade, Literacy, 
     Mathematics, Mysticism, Currency, Code of Laws, 
     Writing, Masonry, Ceremonial Burial, Bronze Working, 
     Alphabet
    
       -> Explosives, Conscription, Rifleman, Refining, 
     Power Plant, Combustion, Automobile, Cruiser, 
     Flight, Armor, Mass Production, Fighter, 
     Advanced Flight, Labor Union, Submarine, 
     Mass Transit, Recycling, Nuclear Fission, Bomber, 
     Carrier, Rocketry, Mech Infantry, Recycling Center, 
     Manhattan Project, Nuclear Power, Nuclear Unit, 
     Space Flight, Nuclear Plant, SS Structure, 
     Apollo Program, Plastic, SS Component, 
     Superconductor, Robotics, Fusion Power, SDI Defence, 
     Artillery, Mfg Plant, SS Module
    
    Theory of Gravity <- University, Philosophy, Astronomy, Literacy, 
     Mathematics, Mysticism, Code of Laws, Writing, 
     Masonry, Ceremonial Burial, Alphabet
    
       -> Isaac Newton, Atomic Theory, Nuclear Fission, 
     Manhattan Project, Nuclear Power, Nuclear Plant, 
     Fusion Power
    
    Gunpowder    <- Invention, Engineering, Construction, Literacy, 
     Currency, Iron Working, Code of Laws, Writing, 
     The Wheel, Masonry, Bronze Working, Alphabet
    
       -> Explosives, Musketeer, Metallurgy, Conscription, 
     Cannon, Electricity, Rifleman, Electronics, Steel, 
     Hydro Plant, Hoover Dam, Computers, Battleship, 
     SETI Program, Combustion, Automobile, Cruiser, 
     Flight, Armor, Mass Production, Fighter, 
     Advanced Flight, Labor Union, Submarine, 
     Mass Transit, Recycling, Nuclear Fission, Bomber, 
     Carrier, Rocketry, Mech Infantry, Recycling Center, 
     Manhattan Project, Nuclear Power, Nuclear Unit, 
     Space Flight, Nuclear Plant, SS Structure, 
     Apollo Program, Plastic, SS Component, 
     Superconductor, Robotics, Fusion Power, SDI Defence, 
     Artillery, Mfg Plant, SS Module
    
    Magnetism    <- Physics, Navigation, Astronomy, Mathematics, 
     Mysticism, Map Making, Masonry, Ceremonial Burial, 
     Alphabet
    
       -> Frigate, Electricity, Electronics, Hydro Plant, 
     Hoover Dam, Computers, SETI Program, 
     Advanced Flight, Bomber, Carrier, Rocketry, 
     Nuclear Power, Nuclear Unit, Space Flight, 
     Nuclear Plant, SS Structure, Apollo Program, 
     Plastic, SS Component, Superconductor, Robotics, 
     Fusion Power, SDI Defence, Artillery, Mfg Plant, 
     SS Module
    
    Steam Engine <- Physics, Invention, Navigation, Engineering, 
     Astronomy, Construction, Literacy, Mathematics, 
     Mysticism, Currency, Code of Laws, Writing, 
     Map Making, The Wheel, Masonry, Ceremonial Burial, 
     Bronze Working, Alphabet
    
       -> Railroad, Ironclad, Darwin's Voyage, 
     Industrialization, Transport, Factory, 
     Women's Suffrage, Steel, Corporation, Communism, 
     Battleship, Refining, Genetic Eng., United Nations, 
     Power Plant, Combustion, Cure for Cancer, 
     Automobile, Cruiser, Flight, Armor, Mass Production, 
     Fighter, Advanced Flight, Labor Union, Submarine, 
     Mass Transit, Recycling, Nuclear Fission, Bomber, 
     Carrier, Rocketry, Mech Infantry, Recycling Center, 
     Manhattan Project, Nuclear Power, Nuclear Unit, 
     Space Flight, Nuclear Plant, SS Structure, 
     Apollo Program, Plastic, SS Component, 
     Superconductor, Robotics, Fusion Power, SDI Defence, 
     Artillery, Mfg Plant, SS Module
    
    Atomic Theory<- Theory of Gravity, Physics, University, Navigation, 
     Philosophy, Astronomy, Literacy, Mathematics, 
     Mysticism, Code of Laws, Writing, Map Making, 
     Masonry, Ceremonial Burial, Alphabet
    
       -> Nuclear Fission, Manhattan Project, Nuclear Power, 
     Nuclear Plant, Fusion Power
    
    Explosives   <- Gunpowder, Chemistry, Invention, University, 
     Medicine, Engineering, Philosophy, Construction, 
     Trade, Literacy, Mathematics, Mysticism, Currency, 
     Iron Working, Code of Laws, Writing, The Wheel, 
     Masonry, Ceremonial Burial, Bronze Working, 
     Alphabet
    
       -> Conscription, Rifleman, Combustion, Automobile, 
     Cruiser, Flight, Armor, Mass Production, Fighter, 
     Advanced Flight, Labor Union, Submarine, 
     Mass Transit, Recycling, Nuclear Fission, Bomber, 
     Carrier, Rocketry, Mech Infantry, Recycling Center, 
     Manhattan Project, Nuclear Power, Nuclear Unit, 
     Space Flight, Nuclear Plant, SS Structure, 
     Apollo Program, Plastic, SS Component, 
     Superconductor, Robotics, Fusion Power, SDI Defence, 
     Artillery, Mfg Plant, SS Module
    
    Metallurgy   <- Gunpowder, Invention, University, Engineering, 
     Philosophy, Construction, Literacy, Mathematics, 
     Mysticism, Currency, Iron Working, Code of Laws, 
     Writing, The Wheel, Masonry, Ceremonial Burial, 
     Bronze Working, Alphabet
    
       -> Cannon, Electricity, Electronics, Steel, 
     Hydro Plant, Hoover Dam, Computers, Battleship, 
     SETI Program, Automobile, Armor, Mass Production, 
     Advanced Flight, Labor Union, Submarine, 
     Mass Transit, Recycling, Nuclear Fission, Bomber, 
     Carrier, Rocketry, Mech Infantry, Recycling Center, 
     Manhattan Project, Nuclear Power, Nuclear Unit, 
     Space Flight, Nuclear Plant, SS Structure, 
     Apollo Program, Plastic, SS Component, 
     Superconductor, Robotics, Fusion Power, SDI Defence, 
     Artillery, Mfg Plant, SS Module
    
    Railroad<- Steam Engine, Physics, Invention, Navigation, 
     Bridge Building, Engineering, Astronomy, 
     Construction, Literacy, Mathematics, Mysticism, 
     Currency, Iron Working, Code of Laws, Writing, 
     Map Making, The Wheel, Masonry, Ceremonial Burial, 
     Bronze Working, Alphabet
    
       -> Darwin's Voyage, Industrialization, Transport, 
     Factory, Women's Suffrage, Steel, Corporation, 
     Communism, Battleship, Refining, Genetic Eng., 
     United Nations, Power Plant, Combustion, 
     Cure for Cancer, Automobile, Cruiser, Flight, Armor, 
     Mass Production, Fighter, Advanced Flight, 
     Labor Union, Submarine, Mass Transit, Recycling, 
     Nuclear Fission, Bomber, Carrier, Rocketry, 
     Mech Infantry, Recycling Center, Manhattan Project, 
     Nuclear Power, Nuclear Unit, Space Flight, 
     Nuclear Plant, SS Structure, Apollo Program, 
     Plastic, SS Component, Superconductor, Robotics, 
     Fusion Power, SDI Defence, Artillery, Mfg Plant, 
     SS Module
    
    Conscription <- Explosives, Gunpowder, Chemistry, Invention, 
     University, Medicine, Engineering, Philosophy, 
     Republic, Construction, Trade, Literacy, 
     Mathematics, Mysticism, Currency, Iron Working, 
     Code of Laws, Writing, The Wheel, Masonry, 
     Ceremonial Burial, Bronze Working, Alphabet
    
       -> Rifleman
    
    Electricity  <- Metallurgy, Magnetism, Gunpowder, Physics, 
     Invention, University, Navigation, Engineering, 
     Philosophy, Astronomy, Construction, Literacy, 
     Mathematics, Mysticism, Currency, Iron Working, 
     Code of Laws, Writing, Map Making, The Wheel, 
     Masonry, Ceremonial Burial, Bronze Working, 
     Alphabet
    
       -> Electronics, Hydro Plant, Hoover Dam, Computers, 
     SETI Program, Advanced Flight, Bomber, Carrier, 
     Rocketry, Nuclear Power, Nuclear Unit, Space Flight, 
     Nuclear Plant, SS Structure, Apollo Program, 
     Plastic, SS Component, Superconductor, Robotics, 
     Fusion Power, SDI Defence, Artillery, Mfg Plant, 
     SS Module
    
    Industrialization <- Railroad, Steam Engine, Physics, Invention, Banking, 
     Navigation, Bridge Building, Engineering, Republic, 
     Astronomy, Construction, Trade, Literacy, 
     Mathematics, Mysticism, Currency, Iron Working, 
     Code of Laws, Writing, Map Making, The Wheel, 
     Masonry, Ceremonial Burial, Bronze Working, 
     Alphabet
    
       -> Transport, Factory, Women's Suffrage, Steel, 
     Corporation, Communism, Battleship, Refining, 
     Genetic Eng., United Nations, Power Plant, 
     Combustion, Cure for Cancer, Automobile, Cruiser, 
     Flight, Armor, Mass Production, Fighter, 
     Advanced Flight, Labor Union, Submarine, 
     Mass Transit, Recycling, Nuclear Fission, Bomber, 
     Carrier, Rocketry, Mech Infantry, Recycling Center, 
     Manhattan Project, Nuclear Power, Nuclear Unit, 
     Space Flight, Nuclear Plant, SS Structure, 
     Apollo Program, Plastic, SS Component, 
     Superconductor, Robotics, Fusion Power, SDI Defence, 
     Artillery, Mfg Plant, SS Module
    
    Electronics  <- Electricity, Metallurgy, Magnetism, Gunpowder, 
     Physics, Invention, University, Navigation, 
     Engineering, Philosophy, Astronomy, Construction, 
     Literacy, Mathematics, Mysticism, Currency, 
     Iron Working, Code of Laws, Writing, Map Making, 
     The Wheel, Masonry, Ceremonial Burial, 
     Bronze Working, Alphabet
    
       -> Hydro Plant, Hoover Dam, Computers, SETI Program, 
     Rocketry, Nuclear Power, Nuclear Unit, Space Flight, 
     Nuclear Plant, SS Structure, Apollo Program, 
     Plastic, SS Component, Superconductor, Robotics, 
     Fusion Power, SDI Defence, Artillery, Mfg Plant, 
     SS Module
    
    Steel   <- Industrialization, Railroad, Metallurgy, 
     Steam Engine, Gunpowder, Physics, Invention, 
     University, Banking, Navigation, Bridge Building, 
     Engineering, Philosophy, Republic, Astronomy, 
     Construction, Trade, Literacy, Mathematics, 
     Mysticism, Currency, Iron Working, Code of Laws, 
     Writing, Map Making, The Wheel, Masonry, 
     Ceremonial Burial, Bronze Working, Alphabet
    
       -> Battleship, Automobile, Armor, Mass Production, 
     Labor Union, Submarine, Mass Transit, Recycling, 
     Nuclear Fission, Mech Infantry, Recycling Center, 
     Manhattan Project, Nuclear Power, Nuclear Plant, 
     Superconductor, Fusion Power, SDI Defence
    
    Corporation  <- Industrialization, Railroad, Steam Engine, Physics, 
     Invention, Banking, Navigation, Bridge Building, 
     Engineering, Republic, Astronomy, Construction, 
     Trade, Literacy, Mathematics, Mysticism, Currency, 
     Iron Working, Code of Laws, Writing, Map Making, 
     The Wheel, Masonry, Ceremonial Burial, 
     Bronze Working, Alphabet
    
       -> Refining, Genetic Eng., Power Plant, Combustion, 
     Cure for Cancer, Automobile, Cruiser, Flight, Armor, 
     Mass Production, Fighter, Advanced Flight, 
     Labor Union, Submarine, Mass Transit, Recycling, 
     Nuclear Fission, Bomber, Carrier, Rocketry, 
     Mech Infantry, Recycling Center, Manhattan Project, 
     Nuclear Power, Nuclear Unit, Space Flight, 
     Nuclear Plant, SS Structure, Apollo Program, 
     Plastic, SS Component, Superconductor, Robotics, 
     Fusion Power, SDI Defence, Artillery, Mfg Plant, 
     SS Module
    
    Communism    <- Industrialization, Railroad, Steam Engine, Physics, 
     Invention, Banking, Navigation, Bridge Building, 
     Engineering, Philosophy, Republic, Astronomy, 
     Construction, Trade, Literacy, Mathematics, 
     Mysticism, Currency, Iron Working, Code of Laws, 
     Writing, Map Making, The Wheel, Masonry, 
     Ceremonial Burial, Bronze Working, Alphabet
    
       -> United Nations, Labor Union, Mech Infantry
    
    Computers    <- Electronics, Electricity, Metallurgy, Magnetism, 
     Gunpowder, Physics, Invention, University, 
     Navigation, Engineering, Philosophy, Astronomy, 
     Construction, Literacy, Mathematics, Mysticism, 
     Currency, Iron Working, Code of Laws, Writing, 
     Map Making, The Wheel, Masonry, Ceremonial Burial, 
     Bronze Working, Alphabet
    
       -> SETI Program, Space Flight, SS Structure, 
     Apollo Program, Plastic, SS Component, 
     Superconductor, Robotics, Fusion Power, SDI Defence, 
     Artillery, Mfg Plant, SS Module
    
    Refining<- Corporation, Industrialization, Railroad, 
     Steam Engine, Chemistry, Physics, Invention, 
     University, Medicine, Banking, Navigation, 
     Bridge Building, Engineering, Philosophy, Republic, 
     Astronomy, Construction, Trade, Literacy, 
     Mathematics, Mysticism, Currency, Iron Working, 
     Code of Laws, Writing, Map Making, The Wheel, 
     Masonry, Ceremonial Burial, Bronze Working, 
     Alphabet
    
       -> Power Plant, Combustion, Automobile, Cruiser, 
     Flight, Armor, Mass Production, Fighter, 
     Advanced Flight, Labor Union, Submarine, 
     Mass Transit, Recycling, Nuclear Fission, Bomber, 
     Carrier, Rocketry, Mech Infantry, Recycling Center, 
     Manhattan Project, Nuclear Power, Nuclear Unit, 
     Space Flight, Nuclear Plant, SS Structure, 
     Apollo Program, Plastic, SS Component, 
     Superconductor, Robotics, Fusion Power, SDI Defence, 
     Artillery, Mfg Plant, SS Module
    
    Genetic Eng. <- Corporation, Industrialization, Railroad, 
     Steam Engine, Physics, Invention, Medicine, Banking, 
     Navigation, Bridge Building, Engineering, 
     Philosophy, Republic, Astronomy, Construction, 
     Trade, Literacy, Mathematics, Mysticism, Currency, 
     Iron Working, Code of Laws, Writing, Map Making, 
     The Wheel, Masonry, Ceremonial Burial, 
     Bronze Working, Alphabet
    
       -> Cure for Cancer
    
    Combustion   <- Refining, Corporation, Industrialization, Railroad, 
     Explosives, Steam Engine, Gunpowder, Chemistry, 
     Physics, Invention, University, Medicine, Banking, 
     Navigation, Bridge Building, Engineering, 
     Philosophy, Republic, Astronomy, Construction, 
     Trade, Literacy, Mathematics, Mysticism, Currency, 
     Iron Working, Code of Laws, Writing, Map Making, 
     The Wheel, Masonry, Ceremonial Burial, 
     Bronze Working, Alphabet
    
       -> Automobile, Cruiser, Flight, Armor, Mass Production, 
     Fighter, Advanced Flight, Labor Union, Submarine, 
     Mass Transit, Recycling, Nuclear Fission, Bomber, 
     Carrier, Rocketry, Mech Infantry, Recycling Center, 
     Manhattan Project, Nuclear Power, Nuclear Unit, 
     Space Flight, Nuclear Plant, SS Structure, 
     Apollo Program, Plastic, SS Component, 
     Superconductor, Robotics, Fusion Power, SDI Defence, 
     Artillery, Mfg Plant, SS Module
    
    Automobile   <- Combustion, Refining, Corporation, Steel, 
     Industrialization, Railroad, Metallurgy, Explosives, 
     Steam Engine, Gunpowder, Chemistry, Physics, 
     Invention, University, Medicine, Banking, 
     Navigation, Bridge Building, Engineering, 
     Philosophy, Republic, Astronomy, Construction, 
     Trade, Literacy, Mathematics, Mysticism, Currency, 
     Iron Working, Code of Laws, Writing, Map Making, 
     The Wheel, Masonry, Ceremonial Burial, 
     Bronze Working, Alphabet
    
       -> Armor, Mass Production, Labor Union, Submarine, 
     Mass Transit, Recycling, Nuclear Fission, 
     Mech Infantry, Recycling Center, Manhattan Project, 
     Nuclear Power, Nuclear Plant, Superconductor, 
     Fusion Power, SDI Defence
    
    Flight  <- Combustion, Refining, Corporation, 
     Industrialization, Railroad, Explosives, 
     Steam Engine, Gunpowder, Chemistry, Physics, 
     Invention, University, Medicine, Banking, 
     Navigation, Bridge Building, Engineering, 
     Philosophy, Republic, Astronomy, Construction, 
     Trade, Literacy, Mathematics, Mysticism, Currency, 
     Iron Working, Code of Laws, Writing, Map Making, 
     The Wheel, Masonry, Ceremonial Burial, 
     Bronze Working, Alphabet
    
       -> Fighter, Advanced Flight, Bomber, Carrier, Rocketry, 
     Nuclear Unit, Space Flight, SS Structure, 
     Apollo Program, Plastic, SS Component, 
     Superconductor, Robotics, Fusion Power, SDI Defence, 
     Artillery, Mfg Plant, SS Module
    
    Mass Production   <- Automobile, Combustion, Refining, Corporation, 
     Steel, Industrialization, Railroad, Metallurgy, 
     Explosives, Steam Engine, Gunpowder, Chemistry, 
     Physics, Invention, University, Medicine, Banking, 
     Navigation, Bridge Building, Engineering, 
     Philosophy, Republic, Astronomy, Construction, 
     Trade, Literacy, Mathematics, Mysticism, Currency, 
     Iron Working, Code of Laws, Writing, Map Making, 
     The Wheel, Masonry, Ceremonial Burial, 
     Bronze Working, Alphabet
    
       -> Labor Union, Submarine, Mass Transit, Recycling, 
     Nuclear Fission, Mech Infantry, Recycling Center, 
     Manhattan Project, Nuclear Power, Nuclear Plant, 
     Superconductor, Fusion Power, SDI Defence
    
    Advanced Flight   <- Flight, Combustion, Refining, Corporation, 
     Industrialization, Electricity, Railroad, 
     Metallurgy, Explosives, Steam Engine, Magnetism, 
     Gunpowder, Chemistry, Physics, Invention, 
     University, Medicine, Banking, Navigation, 
     Bridge Building, Engineering, Philosophy, Republic, 
     Astronomy, Construction, Trade, Literacy, 
     Mathematics, Mysticism, Currency, Iron Working, 
     Code of Laws, Writing, Map Making, The Wheel, 
     Masonry, Ceremonial Burial, Bronze Working, 
     Alphabet
    
       -> Bomber, Carrier, Rocketry, Nuclear Unit, 
     Space Flight, SS Structure, Apollo Program, Plastic, 
     SS Component, Superconductor, Robotics, 
     Fusion Power, SDI Defence, Artillery, Mfg Plant, 
     SS Module
    
    Labor Union  <- Mass Production, Automobile, Combustion, Refining, 
     Communism, Corporation, Steel, Industrialization, 
     Railroad, Metallurgy, Explosives, Steam Engine, 
     Gunpowder, Chemistry, Physics, Invention, 
     University, Medicine, Banking, Navigation, 
     Bridge Building, Engineering, Philosophy, Republic, 
     Astronomy, Construction, Trade, Literacy, 
     Mathematics, Mysticism, Currency, Iron Working, 
     Code of Laws, Writing, Map Making, The Wheel, 
     Masonry, Ceremonial Burial, Bronze Working, 
     Alphabet
    
       -> Mech Infantry
    
    Recycling    <- Mass Production, Automobile, Combustion, Refining, 
     Corporation, Steel, Industrialization, Railroad, 
     Metallurgy, Explosives, Steam Engine, Gunpowder, 
     Chemistry, Physics, Invention, University, 
     Democracy, Medicine, Banking, Navigation, 
     Bridge Building, Engineering, Philosophy, Republic, 
     Astronomy, Construction, Trade, Literacy, 
     Mathematics, Mysticism, Currency, Iron Working, 
     Code of Laws, Writing, Map Making, The Wheel, 
     Masonry, Ceremonial Burial, Bronze Working, 
     Alphabet
    
       -> Recycling Center
    
    Nuclear Fission   <- Mass Production, Automobile, Combustion, Refining, 
     Corporation, Steel, Industrialization, Railroad, 
     Metallurgy, Explosives, Atomic Theory, Steam Engine, 
     Gunpowder, Theory of Gravity, Chemistry, Physics, 
     Invention, University, Medicine, Banking, 
     Navigation, Bridge Building, Engineering, 
     Philosophy, Republic, Astronomy, Construction, 
     Trade, Literacy, Mathematics, Mysticism, Currency, 
     Iron Working, Code of Laws, Writing, Map Making, 
     The Wheel, Masonry, Ceremonial Burial, 
     Bronze Working, Alphabet
    
       -> Manhattan Project, Nuclear Power, Nuclear Plant, 
     Fusion Power
    
    Rocketry<- Advanced Flight, Flight, Combustion, Refining, 
     Corporation, Electronics, Industrialization, 
     Electricity, Railroad, Metallurgy, Explosives, 
     Steam Engine, Magnetism, Gunpowder, Chemistry, 
     Physics, Invention, University, Medicine, Banking, 
     Navigation, Bridge Building, Engineering, 
     Philosophy, Republic, Astronomy, Construction, 
     Trade, Literacy, Mathematics, Mysticism, Currency, 
     Iron Working, Code of Laws, Writing, Map Making, 
     The Wheel, Masonry, Ceremonial Burial, 
     Bronze Working, Alphabet
    
       -> Nuclear Unit, Space Flight, SS Structure, 
     Apollo Program, Plastic, SS Component, 
     Superconductor, Robotics, Fusion Power, SDI Defence, 
     Artillery, Mfg Plant, SS Module
    
    Nuclear Power<- Nuclear Fission, Mass Production, Automobile, 
     Combustion, Refining, Corporation, Steel, 
     Electronics, Industrialization, Electricity, 
     Railroad, Metallurgy, Explosives, Atomic Theory, 
     Steam Engine, Magnetism, Gunpowder, 
     Theory of Gravity, Chemistry, Physics, Invention, 
     University, Medicine, Banking, Navigation, 
     Bridge Building, Engineering, Philosophy, Republic, 
     Astronomy, Construction, Trade, Literacy, 
     Mathematics, Mysticism, Currency, Iron Working, 
     Code of Laws, Writing, Map Making, The Wheel, 
     Masonry, Ceremonial Burial, Bronze Working, 
     Alphabet
    
       -> Nuclear Plant, Fusion Power
    
    Space Flight <- Rocketry, Advanced Flight, Flight, Combustion, 
     Refining, Computers, Corporation, Electronics, 
     Industrialization, Electricity, Railroad, 
     Metallurgy, Explosives, Steam Engine, Magnetism, 
     Gunpowder, Chemistry, Physics, Invention, 
     University, Medicine, Banking, Navigation, 
     Bridge Building, Engineering, Philosophy, Republic, 
     Astronomy, Construction, Trade, Literacy, 
     Mathematics, Mysticism, Currency, Iron Working, 
     Code of Laws, Writing, Map Making, The Wheel, 
     Masonry, Ceremonial Burial, Bronze Working, 
     Alphabet
    
       -> SS Structure, Apollo Program, Plastic, SS Component, 
     Superconductor, Robotics, Fusion Power, SDI Defence, 
     Artillery, Mfg Plant, SS Module
    
    Plastic <- Space Flight, Rocketry, Advanced Flight, Flight, 
     Combustion, Refining, Computers, Corporation, 
     Electronics, Industrialization, Electricity, 
     Railroad, Metallurgy, Explosives, Steam Engine, 
     Magnetism, Gunpowder, Chemistry, Physics, Invention, 
     University, Medicine, Banking, Navigation, 
     Bridge Building, Engineering, Philosophy, Republic, 
     Astronomy, Construction, Trade, Literacy, 
     Mathematics, Mysticism, Currency, Iron Working, 
     Code of Laws, Writing, Map Making, The Wheel, 
     Masonry, Ceremonial Burial, Bronze Working, 
     Alphabet
    
       -> SS Component, Superconductor, Robotics, 
     Fusion Power, SDI Defence, Artillery, Mfg Plant, 
     SS Module
    
    Superconductor    <- Plastic, Space Flight, Rocketry, Advanced Flight, 
     Mass Production, Flight, Automobile, Combustion, 
     Refining, Computers, Corporation, Steel, 
     Electronics, Industrialization, Electricity, 
     Railroad, Metallurgy, Explosives, Steam Engine, 
     Magnetism, Gunpowder, Chemistry, Physics, Invention, 
     University, Medicine, Banking, Navigation, 
     Bridge Building, Engineering, Philosophy, Republic, 
     Astronomy, Construction, Trade, Literacy, 
     Mathematics, Mysticism, Currency, Iron Working, 
     Code of Laws, Writing, Map Making, The Wheel, 
     Masonry, Ceremonial Burial, Bronze Working, 
     Alphabet
    
       -> Fusion Power, SDI Defence
    
    Robotics<- Plastic, Space Flight, Rocketry, Advanced Flight, 
     Flight, Combustion, Refining, Computers, 
     Corporation, Electronics, Industrialization, 
     Electricity, Railroad, Metallurgy, Explosives, 
     Steam Engine, Magnetism, Gunpowder, Chemistry, 
     Physics, Invention, University, Medicine, Banking, 
     Navigation, Bridge Building, Engineering, 
     Philosophy, Republic, Astronomy, Construction, 
     Trade, Literacy, Mathematics, Mysticism, Currency, 
     Iron Working, Code of Laws, Writing, Map Making, 
     The Wheel, Masonry, Ceremonial Burial, 
     Bronze Working, Alphabet
    
       -> Artillery, Mfg Plant, SS Module
    
    Fusion Power <- Superconductor, Plastic, Space Flight, 
     Nuclear Power, Rocketry, Nuclear Fission, 
     Advanced Flight, Mass Production, Flight, 
     Automobile, Combustion, Refining, Computers, 
     Corporation, Steel, Electronics, Industrialization, 
     Electricity, Railroad, Metallurgy, Explosives, 
     Atomic Theory, Steam Engine, Magnetism, Gunpowder, 
     Theory of Gravity, Chemistry, Physics, Invention, 
     University, Medicine, Banking, Navigation, 
     Bridge Building, Engineering, Philosophy, Republic, 
     Astronomy, Construction, Trade, Literacy, 
     Mathematics, Mysticism, Currency, Iron Working, 
     Code of Laws, Writing, Map Making, The Wheel, 
     Masonry, Ceremonial Burial, Bronze Working, 
     Alphabet
    
    
    
    IMPROVEMENTS
    ------------
    
    Temple  <- Ceremonial Burial
    
    Palace  <- Masonry
    
    City Wall    <- Masonry
    
    Granary <- Pottery
    
    Library <- Writing, Alphabet
    
    Courthouse   <- Code of Laws, Alphabet
    
    Marketplace  <- Currency, Bronze Working
    
    Aqueduct<- Construction, Currency, Masonry, Bronze Working
    
    Colosseum    <- Construction, Currency, Masonry, Bronze Working
    
    Fortress<- Construction, Currency, Masonry, Bronze Working
    
    Bank    <- Banking, Republic, Trade, Literacy, Currency, 
     Code of Laws, Writing, Bronze Working, Alphabet
    
    Cathedral    <- Religion, Philosophy, Literacy, Mysticism, 
     Code of Laws, Writing, Ceremonial Burial, Alphabet
    
    University (Imp)  <- University, Philosophy, Literacy, Mathematics, 
     Mysticism, Code of Laws, Writing, Masonry, 
     Ceremonial Burial, Alphabet
    
    Factory <- Industrialization, Railroad, Steam Engine, Physics, 
     Invention, Banking, Navigation, Bridge Building, 
     Engineering, Republic, Astronomy, Construction, 
     Trade, Literacy, Mathematics, Mysticism, Currency, 
     Iron Working, Code of Laws, Writing, Map Making, 
     The Wheel, Masonry, Ceremonial Burial, 
     Bronze Working, Alphabet
    
    Hydro Plant  <- Electronics, Electricity, Metallurgy, Magnetism, 
     Gunpowder, Physics, Invention, University, 
     Navigation, Engineering, Philosophy, Astronomy, 
     Construction, Literacy, Mathematics, Mysticism, 
     Currency, Iron Working, Code of Laws, Writing, 
     Map Making, The Wheel, Masonry, Ceremonial Burial, 
     Bronze Working, Alphabet
    
    Power Plant  <- Refining, Corporation, Industrialization, Railroad, 
     Steam Engine, Chemistry, Physics, Invention, 
     University, Medicine, Banking, Navigation, 
     Bridge Building, Engineering, Philosophy, Republic, 
     Astronomy, Construction, Trade, Literacy, 
     Mathematics, Mysticism, Currency, Iron Working, 
     Code of Laws, Writing, Map Making, The Wheel, 
     Masonry, Ceremonial Burial, Bronze Working, 
     Alphabet
    
    Mass Transit <- Mass Production, Automobile, Combustion, Refining, 
     Corporation, Steel, Industrialization, Railroad, 
     Metallurgy, Explosives, Steam Engine, Gunpowder, 
     Chemistry, Physics, Invention, University, Medicine, 
     Banking, Navigation, Bridge Building, Engineering, 
     Philosophy, Republic, Astronomy, Construction, 
     Trade, Literacy, Mathematics, Mysticism, Currency, 
     Iron Working, Code of Laws, Writing, Map Making, 
     The Wheel, Masonry, Ceremonial Burial, 
     Bronze Working, Alphabet
    
    Recycling Center  <- Recycling, Mass Production, Automobile, Combustion, 
     Refining, Corporation, Steel, Industrialization, 
     Railroad, Metallurgy, Explosives, Steam Engine, 
     Gunpowder, Chemistry, Physics, Invention, 
     University, Democracy, Medicine, Banking, 
     Navigation, Bridge Building, Engineering, 
     Philosophy, Republic, Astronomy, Construction, 
     Trade, Literacy, Mathematics, Mysticism, Currency, 
     Iron Working, Code of Laws, Writing, Map Making, 
     The Wheel, Masonry, Ceremonial Burial, 
     Bronze Working, Alphabet
    
    Nuclear Plant<- Nuclear Power, Nuclear Fission, Mass Production, 
     Automobile, Combustion, Refining, Corporation, 
     Steel, Electronics, Industrialization, Electricity, 
     Railroad, Metallurgy, Explosives, Atomic Theory, 
     Steam Engine, Magnetism, Gunpowder, 
     Theory of Gravity, Chemistry, Physics, Invention, 
     University, Medicine, Banking, Navigation, 
     Bridge Building, Engineering, Philosophy, Republic, 
     Astronomy, Construction, Trade, Literacy, 
     Mathematics, Mysticism, Currency, Iron Working, 
     Code of Laws, Writing, Map Making, The Wheel, 
     Masonry, Ceremonial Burial, Bronze Working, 
     Alphabet
    
    SS Structure <- Space Flight, Rocketry, Advanced Flight, Flight, 
     Combustion, Refining, Computers, Corporation, 
     Electronics, Industrialization, Electricity, 
     Railroad, Metallurgy, Explosives, Steam Engine, 
     Magnetism, Gunpowder, Chemistry, Physics, Invention, 
     University, Medicine, Banking, Navigation, 
     Bridge Building, Engineering, Philosophy, Republic, 
     Astronomy, Construction, Trade, Literacy, 
     Mathematics, Mysticism, Currency, Iron Working, 
     Code of Laws, Writing, Map Making, The Wheel, 
     Masonry, Ceremonial Burial, Bronze Working, 
     Alphabet
    
    SS Component <- Plastic, Space Flight, Rocketry, Advanced Flight, 
     Flight, Combustion, Refining, Computers, 
     Corporation, Electronics, Industrialization, 
     Electricity, Railroad, Metallurgy, Explosives, 
     Steam Engine, Magnetism, Gunpowder, Chemistry, 
     Physics, Invention, University, Medicine, Banking, 
     Navigation, Bridge Building, Engineering, 
     Philosophy, Republic, Astronomy, Construction, 
     Trade, Literacy, Mathematics, Mysticism, Currency, 
     Iron Working, Code of Laws, Writing, Map Making, 
     The Wheel, Masonry, Ceremonial Burial, 
     Bronze Working, Alphabet
    
    SDI Defence  <- Superconductor, Plastic, Space Flight, Rocketry, 
     Advanced Flight, Mass Production, Flight, 
     Automobile, Combustion, Refining, Computers, 
     Corporation, Steel, Electronics, Industrialization, 
     Electricity, Railroad, Metallurgy, Explosives, 
     Steam Engine, Magnetism, Gunpowder, Chemistry, 
     Physics, Invention, University, Medicine, Banking, 
     Navigation, Bridge Building, Engineering, 
     Philosophy, Republic, Astronomy, Construction, 
     Trade, Literacy, Mathematics, Mysticism, Currency, 
     Iron Working, Code of Laws, Writing, Map Making, 
     The Wheel, Masonry, Ceremonial Burial, 
     Bronze Working, Alphabet
    
    Mfg Plant    <- Robotics, Plastic, Space Flight, Rocketry, 
     Advanced Flight, Flight, Combustion, Refining, 
     Computers, Corporation, Electronics, 
     Industrialization, Electricity, Railroad, 
     Metallurgy, Explosives, Steam Engine, Magnetism, 
     Gunpowder, Chemistry, Physics, Invention, 
     University, Medicine, Banking, Navigation, 
     Bridge Building, Engineering, Philosophy, Republic, 
     Astronomy, Construction, Trade, Literacy, 
     Mathematics, Mysticism, Currency, Iron Working, 
     Code of Laws, Writing, Map Making, The Wheel, 
     Masonry, Ceremonial Burial, Bronze Working, 
     Alphabet
    
    SS Module    <- Robotics, Plastic, Space Flight, Rocketry, 
     Advanced Flight, Flight, Combustion, Refining, 
     Computers, Corporation, Electronics, 
     Industrialization, Electricity, Railroad, 
     Metallurgy, Explosives, Steam Engine, Magnetism, 
     Gunpowder, Chemistry, Physics, Invention, 
     University, Medicine, Banking, Navigation, 
     Bridge Building, Engineering, Philosophy, Republic, 
     Astronomy, Construction, Trade, Literacy, 
     Mathematics, Mysticism, Currency, Iron Working, 
     Code of Laws, Writing, Map Making, The Wheel, 
     Masonry, Ceremonial Burial, Bronze Working, 
     Alphabet
    
    
    
    WONDERS OF THE WORLD
    --------------------
    
    Pyramids<- Masonry
    
    Great Wall   <- Masonry
    
    Hanging Garden    <- Pottery
    
    Lighthouse   <- MapMaking, Alphabet
    
    Oracle  <- Mysticism, Ceremonial Burial
    
    Great Library<- Literacy, Code of Laws, Writing, Alphabet
    
    Copernicus   <- Astronomy, Mathematics, Mysticism, Masonry, 
     Ceremonial Burial, Alphabet
    
    Magellan<- Navigation, Astronomy, Mathematics, Mysticism, 
     Map Making, Masonry, Ceremonial Burial, Alphabet
    
    Shakespeare  <- Medicine, Philosophy, Trade, Literacy, Mysticism, 
     Currency, Code of Laws, Writing, Ceremonial Burial, 
     Bronze Working, Alphabet
    
    J.S. Bach    <- Religion, Philosophy, Literacy, Mysticism, 
     Code of Laws, Writing, Ceremonial Burial, Alphabet
    
    Michelangelo <- Religion, Philosophy, Literacy, Mysticism, 
     Code of Laws, Writing, Ceremonial Burial, Alphabet
    
    Isaac Newton <- Theory of Gravity, University, Philosophy, 
     Astronomy, Literacy, Mathematics, Mysticism, 
     Code of Laws, Writing, Masonry, Ceremonial Burial, 
     Alphabet
    
    Darwin's Voyage   <- Railroad, Steam Engine, Physics, Invention, 
     Navigation, Bridge Building, Engineering, Astronomy, 
     Construction, Literacy, Mathematics, Mysticism, 
     Currency, Iron Working, Code of Laws, Writing, 
     Map Making, The Wheel, Masonry, Ceremonial Burial, 
     Bronze Working, Alphabet
    
    Women's Suffrage  <- Industrialization, Railroad, Steam Engine, Physics, 
     Invention, Banking, Navigation, Bridge Building, 
     Engineering, Republic, Astronomy, Construction, 
     Trade, Literacy, Mathematics, Mysticism, Currency, 
     Iron Working, Code of Laws, Writing, Map Making, 
     The Wheel, Masonry, Ceremonial Burial, 
     Bronze Working, Alphabet
    
    Hoover Dam   <- Electronics, Electricity, Metallurgy, Magnetism, 
     Gunpowder, Physics, Invention, University, 
     Navigation, Engineering, Philosophy, Astronomy, 
     Construction, Literacy, Mathematics, Mysticism, 
     Currency, Iron Working, Code of Laws, Writing, 
     Map Making, The Wheel, Masonry, Ceremonial Burial, 
     Bronze Working, Alphabet
    
    United Nations    <- Communism, Industrialization, Railroad, 
     Steam Engine, Physics, Invention, Banking, 
     Navigation, Bridge Building, Engineering, 
     Philosophy, Republic, Astronomy, Construction, 
     Trade, Literacy, Mathematics, Mysticism, Currency, 
     Iron Working, Code of Laws, Writing, Map Making, 
     The Wheel, Masonry, Ceremonial Burial, 
     Bronze Working, Alphabet
    
    SETI Program <- Computers, Electronics, Electricity, Metallurgy, 
     Magnetism, Gunpowder, Physics, Invention, 
     University, Navigation, Engineering, Philosophy, 
     Astronomy, Construction, Literacy, Mathematics, 
     Mysticism, Currency, Iron Working, Code of Laws, 
     Writing, Map Making, The Wheel, Masonry, 
     Ceremonial Burial, Bronze Working, Alphabet
    
    Cure for Cancer   <- Genetic Eng., Corporation, Industrialization, 
     Railroad, Steam Engine, Physics, Invention, 
     Medicine, Banking, Navigation, Bridge Building, 
     Engineering, Philosophy, Republic, Astronomy, 
     Construction, Trade, Literacy, Mathematics, 
     Mysticism, Currency, Iron Working, Code of Laws, 
     Writing, Map Making, The Wheel, Masonry, 
     Ceremonial Burial, Bronze Working, Alphabet
    
    Manhattan Project <- Nuclear Fission, Mass Production, Automobile, 
     Combustion, Refining, Corporation, Steel, 
     Industrialization, Railroad, Metallurgy, Explosives, 
     Atomic Theory, Steam Engine, Gunpowder, 
     Theory of Gravity, Chemistry, Physics, Invention, 
     University, Medicine, Banking, Navigation, 
     Bridge Building, Engineering, Philosophy, Republic, 
     Astronomy, Construction, Trade, Literacy, 
     Mathematics, Mysticism, Currency, Iron Working, 
     Code of Laws, Writing, Map Making, The Wheel, 
     Masonry, Ceremonial Burial, Bronze Working, 
     Alphabet
    
    Apollo Program    <- Space Flight, Rocketry, Advanced Flight, Flight, 
     Combustion, Refining, Computers, Corporation, 
     Electronics, Industrialization, Electricity, 
     Railroad, Metallurgy, Explosives, Steam Engine, 
     Magnetism, Gunpowder, Chemistry, Physics, Invention, 
     University, Medicine, Banking, Navigation, 
     Bridge Building, Engineering, Philosophy, Republic, 
     Astronomy, Construction, Trade, Literacy, 
     Mathematics, Mysticism, Currency, Iron Working, 
     Code of Laws, Writing, Map Making, The Wheel, 
     Masonry, Ceremonial Burial, Bronze Working, 
     Alphabet
    
    
    
    UNITS
    -----
    
    Chariot <- The Wheel
    
    Cavalry <- Horseback Riding
    
    Diplomat<- Writing, Alphabet
    
    Trireme <- MapMaking, Alphabet
    
    Legion  <- Iron Working, Bronze Working
    
    Catapult<- Mathematics, Masonry, Alphabet
    
    Caravan <- Trade, Currency, Code of Laws, Bronze Working, 
     Alphabet
    
    Sail    <- Navigation, Astronomy, Mathematics, Mysticism, 
     Map Making, Masonry, Ceremonial Burial, Alphabet
    
    Knight  <- Chivalry, Feudalism, Monarchy, Code of Laws, 
     Horseback Riding, Masonry, Ceremonial Burial, 
     Alphabet
    
    Musketeer    <- Gunpowder, Invention, Engineering, Construction, 
     Literacy, Currency, Iron Working, Code of Laws, 
     Writing, The Wheel, Masonry, Bronze Working, 
     Alphabet
    
    Frigate <- Magnetism, Physics, Navigation, Astronomy, 
     Mathematics, Mysticism, Map Making, Masonry, 
     Ceremonial Burial, Alphabet
    
    Ironclad<- Steam Engine, Physics, Invention, Navigation, 
     Engineering, Astronomy, Construction, Literacy, 
     Mathematics, Mysticism, Currency, Code of Laws, 
     Writing, Map Making, The Wheel, Masonry, 
     Ceremonial Burial, Bronze Working, Alphabet
    
    Cannon  <- Metallurgy, Gunpowder, Invention, University, 
     Engineering, Philosophy, Construction, Literacy, 
     Mathematics, Mysticism, Currency, Iron Working, 
     Code of Laws, Writing, The Wheel, Masonry, 
     Ceremonial Burial, Bronze Working, Alphabet
    
    Rifleman<- Conscription, Explosives, Gunpowder, Chemistry, 
     Invention, University, Medicine, Engineering, 
     Philosophy, Republic, Construction, Trade, Literacy, 
     Mathematics, Mysticism, Currency, Iron Working, 
     Code of Laws, Writing, The Wheel, Masonry, 
     Ceremonial Burial, Bronze Working, Alphabet
    
    Transport    <- Industrialization, Railroad, Steam Engine, Physics, 
     Invention, Banking, Navigation, Bridge Building, 
     Engineering, Republic, Astronomy, Construction, 
     Trade, Literacy, Mathematics, Mysticism, Currency, 
     Iron Working, Code of Laws, Writing, Map Making, 
     The Wheel, Masonry, Ceremonial Burial, 
     Bronze Working, Alphabet
    
    Battleship   <- Steel, Industrialization, Railroad, Metallurgy, 
     Steam Engine, Gunpowder, Physics, Invention, 
     University, Banking, Navigation, Bridge Building, 
     Engineering, Philosophy, Republic, Astronomy, 
     Construction, Trade, Literacy, Mathematics, 
     Mysticism, Currency, Iron Working, Code of Laws, 
     Writing, Map Making, The Wheel, Masonry, 
     Ceremonial Burial, Bronze Working, Alphabet
    
    Cruiser <- Combustion, Refining, Corporation, 
     Industrialization, Railroad, Explosives, 
     Steam Engine, Gunpowder, Chemistry, Physics, 
     Invention, University, Medicine, Banking, 
     Navigation, Bridge Building, Engineering, 
     Philosophy, Republic, Astronomy, Construction, 
     Trade, Literacy, Mathematics, Mysticism, Currency, 
     Iron Working, Code of Laws, Writing, Map Making, 
     The Wheel, Masonry, Ceremonial Burial, 
     Bronze Working, Alphabet
    
    Armor   <- Automobile, Combustion, Refining, Corporation, 
     Steel, Industrialization, Railroad, Metallurgy, 
     Explosives, Steam Engine, Gunpowder, Chemistry, 
     Physics, Invention, University, Medicine, Banking, 
     Navigation, Bridge Building, Engineering, 
     Philosophy, Republic, Astronomy, Construction, 
     Trade, Literacy, Mathematics, Mysticism, Currency, 
     Iron Working, Code of Laws, Writing, Map Making, 
     The Wheel, Masonry, Ceremonial Burial, 
     Bronze Working, Alphabet
    
    Fighter <- Flight, Combustion, Refining, Corporation, 
     Industrialization, Railroad, Explosives, 
     Steam Engine, Gunpowder, Chemistry, Physics, 
     Invention, University, Medicine, Banking, 
     Navigation, Bridge Building, Engineering, 
     Philosophy, Republic, Astronomy, Construction, 
     Trade, Literacy, Mathematics, Mysticism, Currency, 
     Iron Working, Code of Laws, Writing, Map Making, 
     The Wheel, Masonry, Ceremonial Burial, 
     Bronze Working, Alphabet
    
    Submarine    <- Mass Production, Automobile, Combustion, Refining, 
     Corporation, Steel, Industrialization, Railroad, 
     Metallurgy, Explosives, Steam Engine, Gunpowder, 
     Chemistry, Physics, Invention, University, Medicine, 
     Banking, Navigation, Bridge Building, Engineering, 
     Philosophy, Republic, Astronomy, Construction, 
     Trade, Literacy, Mathematics, Mysticism, Currency, 
     Iron Working, Code of Laws, Writing, Map Making, 
     The Wheel, Masonry, Ceremonial Burial, 
     Bronze Working, Alphabet
    
    Bomber  <- Advanced Flight, Flight, Combustion, Refining, 
     Corporation, Industrialization, Electricity, 
     Railroad, Metallurgy, Explosives, Steam Engine, 
     Magnetism, Gunpowder, Chemistry, Physics, Invention, 
     University, Medicine, Banking, Navigation, 
     Bridge Building, Engineering, Philosophy, Republic, 
     Astronomy, Construction, Trade, Literacy, 
     Mathematics, Mysticism, Currency, Iron Working, 
     Code of Laws, Writing, Map Making, The Wheel, 
     Masonry, Ceremonial Burial, Bronze Working, 
     Alphabet
    
    Carrier <- Advanced Flight, Flight, Combustion, Refining, 
     Corporation, Industrialization, Electricity, 
     Railroad, Metallurgy, Explosives, Steam Engine, 
     Magnetism, Gunpowder, Chemistry, Physics, Invention, 
     University, Medicine, Banking, Navigation, 
     Bridge Building, Engineering, Philosophy, Republic, 
     Astronomy, Construction, Trade, Literacy, 
     Mathematics, Mysticism, Currency, Iron Working, 
     Code of Laws, Writing, Map Making, The Wheel, 
     Masonry, Ceremonial Burial, Bronze Working, 
     Alphabet
    
    Mech Infantry<- Labor Union, Mass Production, Automobile, 
     Combustion, Refining, Communism, Corporation, Steel, 
     Industrialization, Railroad, Metallurgy, Explosives, 
     Steam Engine, Gunpowder, Chemistry, Physics, 
     Invention, University, Medicine, Banking, 
     Navigation, Bridge Building, Engineering, 
     Philosophy, Republic, Astronomy, Construction, 
     Trade, Literacy, Mathematics, Mysticism, Currency, 
     Iron Working, Code of Laws, Writing, Map Making, 
     The Wheel, Masonry, Ceremonial Burial, 
     Bronze Working, Alphabet
    
    Nuclear Unit <- Rocketry, Advanced Flight, Flight, Combustion, 
     Refining, Corporation, Electronics, 
     Industrialization, Electricity, Railroad, 
     Metallurgy, Explosives, Steam Engine, Magnetism, 
     Gunpowder, Chemistry, Physics, Invention, 
     University, Medicine, Banking, Navigation, 
     Bridge Building, Engineering, Philosophy, Republic, 
     Astronomy, Construction, Trade, Literacy, 
     Mathematics, Mysticism, Currency, Iron Working, 
     Code of Laws, Writing, Map Making, The Wheel, 
     Masonry, Ceremonial Burial, Bronze Working, 
     Alphabet
    
    Artillery    <- Robotics, Plastic, Space Flight, Rocketry, 
     Advanced Flight, Flight, Combustion, Refining, 
     Computers, Corporation, Electronics, 
     Industrialization, Electricity, Railroad, 
     Metallurgy, Explosives, Steam Engine, Magnetism, 
     Gunpowder, Chemistry, Physics, Invention, 
     University, Medicine, Banking, Navigation, 
     Bridge Building, Engineering, Philosophy, Republic, 
     Astronomy, Construction, Trade, Literacy, 
     Mathematics, Mysticism, Currency, Iron Working, 
     Code of Laws, Writing, Map Making, The Wheel, 
     Masonry, Ceremonial Burial, Bronze Working, 
     Alphabet
    
    

    Index, Civilopedia, Citiy Names, Wonders, Advance Table, Advances Cross Refference
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