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- Economic and Social Research Institute (Reston, Va.)4
- Environmental Systems Research Institute (Redlands, Calif.)4
- Tele Atlas North America, Inc.4
- Geological Survey (U.S.)2
- Tele Atlas (Firm : U.S.)2
- Esri1
- National Atlas of the United States1
- National Atlas of the United States and the United States Geological Survey1
- TomTom International (Firm)1
- United States. Bureau of Transportation Statistics1