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Map and Government Information Library
Federal Web Sites
In particular Maps, Images, and Publications & the Library
National Geologic Map Database
From the USGS and comprised of the Map Catalog, Stratigraphy, the Map View and the Topo View.
Science.gov searches over 55 databases and over 2100 selected websites from 15 federal agencies, offering 200 million pages of authoritative U.S. government science information including research and development results. Science.gov is governed by the interagency Science.gov Alliance
The purpose of Data.gov is to increase public access to high value, machine readable datasets generated by the Executive Branch of the Federal Government.
USGS: Maps, Imagery, and Publications