Detailed Information
URL: http://ngmdb.usgs.gov/Title: USGS National Geologic Map Database
Description: Searchable catalog of paper and digital geologic maps, mostly for the U.S. Maps and related data cover: geology, hazards, earth resources, geophysics, geochemistry, geochronology, paleontology, and marine geology.
Directory: Science/Earth_Sciences/Geology/Regional
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