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- Hart Energy Publishing12
- Geological Survey (U.S.)9
- United States. Bureau of Transportation Statistics6
- TTG, Inc.3
- Environmental Systems Research Institute (Redlands, Calif.)2
- National Atlas of the United States2
- United States. Bureau of the Census. Geography Division2
- Firestine, Theresa1
- Hudgins, Andrew1
- Institute for Water Resources (U.S.). Navigation Data Center1
- National Biodiesel Board1
- National Renewable Energy Laboratory (U.S.)1
- Rawson, Peg1
- Strocko, Ed1
- Tele Atlas (Firm : U.S.)1
- U.S. Census Bureau. Geography Division1
- United States. Bureau of Transportation Statisticsf1
- United States. Department of Housing and Urban Development1
- United States. Environmental Protection Agency.1
- United States. Federal Transit Administration1