A commenter asked me for USA map keys today. I never realized that I didn’t post those. I totally take requests, yo!
All of the d-maps should be traceable on top of each other so you can get rivers in with the states, etc. I couldn’t find a d-map with mountains, so I pulled it from this site (http://gamesforgeography.com/learn_united_states_features.html). It’s not going to be the identical size like the d-maps, but hopefully you can get what you need.
4GRD map-o-rama as pdf