Free sources of topographics maps (see list below)
With
Natural Scene Designer, you can view a topographic map from any
viewpoint in 3D!
Also creates realistic pictures, fly through animations, and shaded
relief map backgrounds.
Click here to find out more
Free
Topographic Map (DRG) and GIS Data Sources for all 50 US States
This
is a list of online sources for Digital Topographic Maps. When
combined with Digital Elevation Models they
can be used with Natural Scene
Designer to create pictures like the one above
Note: Some websites refer to Topographic Maps as 'DRGs'.