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Author
- Hart Energy Publishing8
- United States. Bureau of Transportation Statistics2
- Firestine, Theresa1
- Geological Survey (U.S.)1
- Hudgins, Andrew1
- Institute for Water Resources (U.S.). Navigation Data Center1
- National Biodiesel Board1
- National Renewable Energy Laboratory (U.S.)1
- TTG, Inc.1
- United States. Bureau of Transportation Statisticsf1
- United States. Environmental Protection Agency.1
- United States. Federal Transit Administration1
- Waterborne Commerce Statistics Center (U.S.)1