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The National Geologic Map Database and Mapping in Progress are managed by the USGS's National Cooperative Geologic Mapping Program in cooperation with the Association of American State Geologists.

U.S. Department of the Interior, U.S. Geological Survey, Reston, VA, USA
URL http://ngmdb.usgs.gov/MapProgress/MPredirect.html
Database project personnel
Last Modified : March 22, 2006