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- United States. Bureau of Transportation Statistics15
- National Geophysical Data Center8
- Environmental Systems Research Institute (Redlands, Calif.)7
- Geological Survey (U.S.)7
- National Atlas of the United States6
- United States. Bureau of the Census. Geography Division5
- Bush, Charles A.3
- Reed, John Calvin, Jr. 1930-3
- TomTom North America, Inc3
- United States. Federal Aviation Administration2
- Vanderbilt Engineering Center for Transportation Operations and Research2
- Waterborne Commerce Statistics Center (U.S.)2
- Canada Centre for Mapping1
- Institute for Water Resources (U.S.). Navigation Data Center1
- Instituto Nacional de Estadística, Geografía e Informática (Mexico)1
- Rawson, Peg1
- Strocko, Ed1
- U.S. Census Bureau. Geography Division1
- USGS National Center for EROS1
- United States. Office of the Deputy Under Secretary of Defense (Installations and Environment)1
