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Category One - Geologic themes (Help)

GEOLOGY
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Category Two - Geographic area

Category Three - Miscellaneous search criteria

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The National Geologic Map Database is managed by the USGS's National Cooperative Geologic Mapping Program in cooperation with the Association of American State Geologists.
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Last modified: February 28, 2008
URL http://ngmdb.usgs.gov/ngmdb/ngm_compsearch.html

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