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Author
- United States. Bureau of Transportation Statistics6
- Geological Survey (U.S.)5
- United States. Bureau of the Census. Geography Division4
- National Atlas of the United States3
- Hijmans, Robert J.2
- University of California, Berkeley. Museum of Vertebrate Zoology2
- Environmental Systems Research Institute (Redlands, Calif.)1
- Rawson, Peg1
- TomTom North America, Inc.1