Publisher
- National Atlas of the United States87
- Geological Survey (U.S.)33
- U.S. Census Bureau. Geography Division2
- Canada Centre for Mapping1
- Cartography Associates1
- Gap Analysis Program (U.S.)1
- Instituto Nacional de Estadística, Geografía e Informática (Mexico)1
- National Geospatial Program, The National Map Small Scale1
- United States. Bureau of Transportation Statistics1