There's other stuff that's not crystal clear either. For instance, the Pottery tech has a +1 something on it that isn't clearly defined in the rules as far as we've found. I believe it's supposed to be culure event hand size.
Sorry for the thread-jack, but does anyone know where I can get the original bookcase Civilization game the computer games were based on? Trying to look on the interwebs brings up the new FFG game almost exclusively (which is kind of ironic, a board game based on a computer game based on a board game.)
Are you referring to the Eagle Games version, or the Avalon Hill version? If the latter, I have a copy I picked up on eBay some years back. If you're looking on eBay, I'd include "Avalon Hill" or "AH" in your search criteria. Here's the link to one of the current auctions:
Civilization Avalon Hill - eBay (item 130478629796 end time Jan-28-11 10:57:15 PST)
Hope this helps.