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- Hart Energy Publishing47
- Geological Survey (U.S.)17
- TTG, Inc.16
- Environmental Systems Research Institute (Redlands, Calif.)15
- United States. Bureau of Transportation Statistics12
- United States. Department of Housing and Urban Development11
- National Atlas of the United States10
- National Energy Information Center (U.S.)10
- Geological Survey (U.S.) Minerals Information Team9
- National Biodiesel Board4
- National Renewable Energy Laboratory (U.S.)3
- U.S. Census Bureau3
- United States. Environmental Protection Agency.3
- Hunt, Raquel2
- Institute for Water Resources (U.S.). Navigation Data Center2
- Tele Atlas (Firm : U.S.)2
- Waterborne Commerce Statistics Center (U.S.)2
- Arndt, Raymond E.1
- Bawiec, Walter J.1
- Beikman, Helen M.1