Creator
- National Atlas of the United States7
- Geological Survey (U.S.)6
- Environmental Systems Research Institute (Redlands, Calif.)2
- Canada Centre for Mapping1
- Instituto Nacional de Estadística, Geografía e Informática (Mexico)1
- United States. Agricultural Research Service1
- United States. Bureau of Transportation Statistics1
- United States. Federal Transit Administration1
- United States. Forest Service1