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- United States. Department of Housing and Urban Development55
- United States. Bureau of Transportation Statistics32
- National Atlas of the United States20
- Research and Innovative Technology Administration's Bureau of Transportation Statistics (RITA/BTS)20
- Geological Survey (U.S.)18
- Stackhouse, Cecil17
- Federal Highway Administration, Office of Planning, HEPP-113
- Kelso, Nathaniel Vaughn8
- Patterson, Tom8
- U.S. Bureau of the Census (BOC)8
- U.S. Environmental Protection Agency7
- Bureau of Transportation Statistics6
- Bureau of Transportation Statistics (BTS)6
- ICF Consulting6
- United States. Bureau of the Census. Geography Division6
- Environmental Systems Research Institute (Redlands, Calif.)5
- U.S. Bureau of the Census5
- Research and Innovative Technology Administration's Bureau of Transportation Statistics4
- Federal Highway Administration3
- Gap Analysis Program (U.S.)3