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USGS National Geologic Map Database
Listed in the directory · updated 23 Jul 2022
About USGS National Geologic Map Database
USGS National Geologic Map Database- 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.