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- United States. Bureau of Transportation Statistics35
- Stackhouse, Cecil17
- United States. Bureau of the Census. Geography Division7
- Rawson, Peg2
- United States. Federal Aviation Administration2
- United States. Federal Transit Administration2
- Vanderbilt Engineering Center for Transportation Operations and Research2
- Waterborne Commerce Statistics Center (U.S.)2
- Institute for Water Resources (U.S.). Navigation Data Center1
- Strocko, Ed1
- United States. Federal Highway Administration1
- United States. Office of the Deputy Under Secretary of Defense (Installations and Environment)1