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Author
- US Environmental Protection Agency2
- United States. Bureau of Transportation Statistics2
- Environmental Systems Research Institute (Redlands, Calif.)1
- Esri1
- Firestine, Theresa1
- Hudgins, Andrew1
- Institute for Water Resources (U.S.). Navigation Data Center1
- TTG, Inc.1
- U.S. Census Bureau. Geography Division1
- U.S. Department of Commerce, Census Bureau, Geography Division1
- United States. Bureau of Transportation Statisticsf1
- United States. Federal Transit Administration1
- Waterborne Commerce Statistics Center (U.S.)1