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- Stackhouse, Cecil17
- United States. Bureau of Transportation Statistics16
- Esri4
- National Atlas of the United States3
- TomTom North America, Inc.3
- National Atlas of the United States and the United States Geological Survey2
- Environmental Systems Research Institute (Redlands, Calif.)1
- Geological Survey (U.S.)1
- Ritters, Kurt1
- Tele Atlas (Firm : U.S.)1
- Tele Atlas North America, Inc.1
- United States Geological Survey1
- United States. Agricultural Research Service1
- United States. Forest Service1