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- United States. Bureau of Transportation Statistics27
- Research and Innovative Technology Administration's Bureau of Transportation Statistics (RITA/BTS)10
- ESRI7
- Environmental Systems Research Institute (Redlands, Calif.)6
- Tele Atlas North America, Inc.6
- Federal Railroad Administration (FRA)5
- United States. Federal Highway Administration.5
- Bureau of Transportation Statistics3
- FHWA3
- Federal Transit Administration (FTA)3
- International Steering Committee for Global Mapping (ISCGM)3
- TomTom North America, Inc.3
- United States. Army. Corps of Engineers.3
- Economic and Social Research Institute (Reston, Va.)2
- Federal Highway Administration2
- Federal Highway Administration (FHWA)2
- National Atlas of the United States and the United States Geological Survey2
- United States. Department of Transportation. Research and Innovative Technology Administration2
- Vanderbilt Engineering Center for Transportation Operations and Research Vanderbilt University2
- Federal Aviation Administration1