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Author
- Stackhouse, Cecil17
- United States. Bureau of Transportation Statistics16
- Esri2
- Gap Analysis Program (U.S.)2
- National Atlas of the United States2
- TomTom North America, Inc.2
- Environmental Systems Research Institute (Redlands, Calif.)1
- National Atlas of the United States and the United States Geological Survey1
- Tele Atlas (Firm : U.S.)1