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Maps of the United States

Major USGS Discipline sites:  Water, Geology, Geography , Biology

Science in Your Backyard  (State index)

USGS Circular 1050 (History of the USGS)

Earthquake Hazards Program (current and historical earthquake information)

Subscribe to automated earthquake messages

USGS Water Data for the Nation

The Libre Map Project  offers free, high-quality USGS DRG maps in TIFF format along with world files for use with your GIS software

TerraServer-USA  and Acme host USGS topographic maps (and aerial photos on TerraServer-USA); Maptech  hosts historical USGS topos in the northeast U.S.