| Directory > Regional > North America > United States > Science and Environment > Geology State Geologic Maps of All 50 States
Collection of electronic versions of bedrock, surficial, and structural maps.
http://geology.about.com/cs/geomapsusstates/
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A Tapestry of Time and Terrain
Geologic, topographic, and physiographic province maps of the U.S., from the U.S. Geological
Survey.
http://tapestry.usgs.gov/
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