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- United States. Bureau of Transportation Statistics10
- National Atlas of the United States7
- Geological Survey (U.S.)4
- GfK MACON4
- TomTom North America, Inc.4
- Environmental Systems Research Institute (Redlands, Calif.)3
- Esri3
- National Atlas of the United States and the United States Geological Survey3
- Waterborne Commerce Statistics Center (U.S.)3
- TomTom International (Firm)2
- United States. Federal Aviation Administration2
- United States. Federal Highway Administration2
- United States. Federal Transit Administration2
- Vanderbilt Engineering Center for Transportation Operations and Research2
- Central Intelligence Agency1
- Institute for Water Resources (U.S.). Navigation Data Center1
- Strocko, Ed1
- United States. Bureau of Transportation Statisticsf1