Ooooh, that is nice. 
One improvement I tried to make early on was an "oil refinery", which would boost production, but only if there was an oil resource in the city radius. I had to make it a minor wonder because there was no way in heck I was going to let every city build it.

One improvement I tried to make early on was an "oil refinery", which would boost production, but only if there was an oil resource in the city radius. I had to make it a minor wonder because there was no way in heck I was going to let every city build it.
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