ngmdb.usgs.gov

	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.

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URLs from ngmdb.usgs.gov:

URL: http://ngmdb.usgs.gov/Info/NACSN/Code2/code2.html

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URL: http://ngmdb.usgs.gov/Geolex/geolex_home.html

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URL: http://ngmdb.usgs.gov/Geolex/Refsmry/sumry_856.html

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URL: http://ngmdb.usgs.gov/MapProgress/24k_98/NH/NH_24k_98.htm

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URL: http://ngmdb.usgs.gov

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