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Author
- Geological Survey (U.S.)10
- Instituto Nacional de Estadística, Geografía e Informática (Mexico)8
- Canada Centre for Remote Sensing6
- U.S. Geological Survey in cooperation with U.S. Environmental Protection Agency5
- National Atlas of the United States4
- Environmental Systems Research Institute (Redlands, Calif.)3
- Canada Centre for Mapping2
- Esri2
- TTG, Inc.2
- United States. Environmental Protection Agency2
- California. Department of Fish and Game. Marine Resources Region1
- United States. Bureau of Transportation Statistics1
- United States. Federal Transit Administration1
- United States. Forest Service1