[Rules] Terrain key?

[larrymm]

I just received my first PG game in many years (An Army at Dawn) and noticed the terrain key is  no longer part of the TEC. Granted AAAD has little variation in the way of terrain, I still would like to have a definitive key to the now myriad terrain types. For example: I assume a village is one hex and a town more than one. I also assume that there are only roads on the AAAD maps, not trails or paths. Is this correct?

I tried searching the forums for "terrain key", but didn't find a comprehensive list. If there is an updated terrain key that I've missed, perhaps it could be included as part of the home page rules and charts menu?