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- United States. Bureau of Transportation Statistics6
- United States. Bureau of the Census. Geography Division2
- Firestine, Theresa1
- Hudgins, Andrew1
- Institute for Water Resources (U.S.). Navigation Data Center1
- Rawson, Peg1
- Strocko, Ed1
- United States. Bureau of Transportation Statisticsf1
- United States. Federal Transit Administration1
- Waterborne Commerce Statistics Center (U.S.)1