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- United States. Bureau of Transportation Statistics35
- Stackhouse, Cecil17
- United States. Bureau of the Census. Geography Division7
- Hijmans, Robert J.2
- Rawson, Peg2
- United States. Federal Aviation Administration2
- United States. Federal Transit Administration2
- University of California, Berkeley. Museum of Vertebrate Zoology2
- Vanderbilt Engineering Center for Transportation Operations and Research2
- Waterborne Commerce Statistics Center (U.S.)2
- ESRI1
- Environmental Systems Research Institute (Redlands, Calif.)1
- Esri1
- Geological Survey (U.S.)1
- Institute for Water Resources (U.S.). Navigation Data Center1
- Strocko, Ed1
- U.S. Census Bureau. Geography Division1
- U.S. Department of Commerce, Census Bureau, Geography Division1
- United States. Federal Highway Administration1
- United States. Office of the Deputy Under Secretary of Defense (Installations and Environment)1