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Author
- United States Geological Survey4
- ESRI3
- Economic and Social Research Institute (Reston, Va.)3
- Environmental Systems Research Institute (Redlands, Calif.)3
- Economic and Social Research Institute1
- Esri1
- National Atlas of the United States and the United States Geological Survey1
- Tele Atlas (Firm : U.S.)1
- Tele Atlas North America, Inc.1
- TomTom North America, Inc.1