Sorry about that, Chief
I have two newbie type questions....Yes, Labs are Urban Buildings. The Farms and Mines cards have a slightly different color from the Urban Buildings cards.
1) Is a lab an urban building? (I would say yes). But Farms and Mines are not.
2) I realize there are no hard and fast rules, but would sacrifice two or three civil actions for a good (ie: one that you can see as being particularly useful for yourself) card?That's the crux of the game. If you missed getting Age I Farm AND Mine upgrades, you might want to spend 3 actions to pick up a Coal card. If it's going to cost you more than two actions to work around NOT getting a particular tech, you might want to spend 3 actions to pick that tech up.