I used to use TopoZone to do research using their online topo maps. I see Trails.com has bought TopoZone and almost all of the online map info is no longer available without a subscription... Anybody know of another source for online topos?
The original Microsoft Terra-server is OK for this. The interface is a little old by todays online mapping standards, but all of the maps are there.
http://terraserver-usa.com
Bingo! We have a winner! Thanks!