Need a source for historical road maps

Originally Posted by Jason Weiser

Hey guys,
Am writing an adventure centered in VA, and I am trying to get some road maps ca. 1997 for obvious reasons. Anyone know a good online source for them? I don't need anything better than road maps, I can do the terrain analysis via Google Earth.

Please let me know? I have tried several searches, but the answer is probably painfully obvious.

Will the player characters be securing the NRA National Headquarters in Fairfax?