Creator
- United States. Bureau of Transportation Statistics18
- Stackhouse, Cecil17
- National Atlas of the United States4
- Gap Analysis Program (U.S.)3
- Geological Survey (U.S.)3
- Wade, Tim2
- Environmental Systems Research Institute (Redlands, Calif.)1
- John A. Volpe National Transportation Systems Center (U.S.)1
- Miller, David1
- Patuxent Wildlife Research Center1
- Ritters, Kurt1
- United States. Agricultural Research Service1
- United States. Department of Housing and Urban Development1
- United States. Environmental Protection Agency1
- United States. Forest Service1