Didn't see this posted anywhere else.
Ooh, there's a whole lot of rare resources in this game:
Aluminum
Increases speed of aircraft while reducing their cost.
Amber
Increases sell costs and decreases buy costs at the Market (you buy and sell resources to correct shortage and exploit surplus).
Bison
Granary Research costs reduced.
Citrus
Ships at sea heal automatically.
Coal
Reduces the price of everything that costs Timber .
Copper
Factory and Dock units receive increased hit points.
Cotton
Barracks, Stable, and Dock production times reduced.
Diamonds
Commerce limit increased.
Dye
Cost of Civic research reduced.
Fish
A rare food resource. Dispatch Fishermen from the Dock; boost your Food production without building more Cities to hold more Farms.
Fur
Cost of Military technology research reduced.
Gems
National borders increased.
Horses
Cost of Stable units decreased.
Marble
Cost to build Wonders reduced.
Obsidian
Archers, Towers, Forts, and Cities gain attack power.
Papyrus
Cost of Science research reduced.
Peacocks
Population limit increased.
Relics
Reduces research and upgrade times.
Rubber
Cost of Auto Plant units reduced.
Salt
Cost of Barracks units reduced.
Silk
Cost of Commerce research reduced.
Silver
Age advancement cost reduced.
Spice
Caravan income increased.
Sugar
Reduces all Food costs.
Sulphur
Cost of Siege and Artillery units reduced.
Titanium
Attrition (automatic damage in enemy territory) reduced.
Tobacco
Citizens construct buildings and Wonders faster.
Uranium
Nuclear missiles faster and cheaper.
Whales
Sailing ship speed increased.
Wine
Cost of unit upgrades reduced.
Wool
Citizens produced faster and cheaper.
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