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Author
- United States. Bureau of Transportation Statistics3
- Environmental Systems Research Institute (Redlands, Calif.)2
- National Atlas of the United States2
- United States. Bureau of the Census. Geography Division2
- Esri1
- Rawson, Peg1
- Tele Atlas (Firm : U.S.)1
- U.S. Census Bureau. Geography Division1
- U.S. Department of Commerce, Census Bureau, Geography Division1