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- United States. Bureau of Transportation Statistics37
- Geological Survey (U.S.)35
- National Atlas of the United States33
- Environmental Systems Research Institute (Redlands, Calif.)24
- Stackhouse, Cecil17
- TomTom North America, Inc.9
- National Geophysical Data Center8
- United States. Bureau of the Census. Geography Division7
- Bush, Charles A.5
- Reed, John Calvin, Jr. 1930-5
- Tele Atlas (Firm : U.S.)5
- Waterborne Commerce Statistics Center (U.S.)3
- EROS Data Center2
- Gap Analysis Program (U.S.)2
- Hijmans, Robert J.2
- Rawson, Peg2
- TomTom International (Firm)2
- U.S. Census Bureau. Geography Division2
- United States. Federal Aviation Administration2
- United States. Federal Highway Administration2