The United States Geological Survey (USGS) is the primary civilian mapping agency of the United States. Materials available at this site include general information about topographic mapping, and information about USGS map products and how to obtain them. There is also information on digital raster graphics (DRG), scanned images of U.S. Geological Survey (USGS) standard series topographic maps. Other links provide access to data on map revisions, map symbols, mapping standards, and the National Map, a new interactive online mapping application.
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