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Geological Survey (U.S.)
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Metropolitan areas
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1. United States National Atlas Urbanized Areas, 2001
2001. National Atlas of the United States, Environmental Systems Research Institute (Redlands, Calif.), and Geological Survey (U.S.). This polygon shapefile represents urban areas in the United States derived from the urban areas layer of the Digital Chart of the World (DCW). Data... Environmental Systems Research Institute (Redlands, Calif.).
2. Urban Areas of the United States, 2001
2001. Geological Survey (U.S.). This data set includes a selection of urban areas in the United States derived from the urban areas layer of the Digital Chart of the World (DCW). ... Geological Survey (U.S.).