Creator
- Geological Survey (U.S.)8
- National Atlas of the United States4
- United States. Bureau of Transportation Statistics3
- Canada Centre for Remote Sensing2
- Environmental Systems Research Institute (Redlands, Calif.)2
- Instituto Nacional de Estadística, Geografía e Informática (Mexico)2
- United States. Bureau of the Census. Geography Division2
- Wade, Tim2
- Institute for Water Resources (U.S.). Navigation Data Center1
- Rawson, Peg1
- Ritters, Kurt1
- United States. Forest Service1