Publisher
- United States. Bureau of Transportation Statistics38
- National Atlas of the United States32
- Geological Survey (U.S.)15
- Environmental Systems Research Institute (Redlands, Calif.)5
- Gap Analysis Program (U.S.)2
- International Rice Research Institute2
- University of California, Berkeley. Museum of Vertebrate Zoology2
- Canada Centre for Mapping1
- Instituto Nacional de Estadística, Geografía e Informática (Mexico)1
- National Energy Information Center (U.S.)1