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- Hart Energy Publishing12
- Environmental Systems Research Institute (Redlands, Calif.)8
- Geological Survey (U.S.)7
- United States. Department of Housing and Urban Development7
- National Biodiesel Board4
- National Energy Information Center (U.S.)4
- Blades, Doug1
- Institute for Water Resources (U.S.). Navigation Data Center1
- Lubkin, Samantha 1
- National Atlas of the United States1
- Tele Atlas (Firm : U.S.)1
- TomTom International (Firm)1
- United States Geological Survey1
- United States. Bureau of Transportation Statistics1
- United States. Federal Highway Administration1