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Author
- Geological Survey (U.S.)4
- National Atlas of the United States4
- Environmental Systems Research Institute (Redlands, Calif.)3
- Esri3
- National Atlas of the United States and the United States Geological Survey2
- U.S. Geological Survey in cooperation with U.S. Environmental Protection Agency2
- Canada Centre for Remote Sensing1
- Environmental Systems Research Institute, Inc. (ESRI)1
- Geographic Data Technology, Inc. (GDT)1
- Geological Survey (U.S.). Water Resources Division. Wisconsin District1
- Instituto Nacional de Estadística, Geografía e Informática (Mexico)1
- United States. Bureau of Transportation Statistics1
- United States. Bureau of the Census. Geography Division1
- United States. Environmental Protection Agency1