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Author
- United States. Bureau of Transportation Statistics26
- National Atlas of the United States13
- Research and Innovative Technology Administration's Bureau of Transportation Statistics (RITA/BTS)9
- Geological Survey (U.S.)6
- Thomas, William G., 1964-6
- Federal Highway Administration4
- Hunt, Raquel4
- Vanderbilt Engineering Center for Transportation Operations and Research4
- Bureau of Transportation Statistics3
- Environmental Systems Research Institute (Redlands, Calif.)3
- Research and Innovative Technology Administration's Bureau of Transportation Statistics3
- United States. Federal Highway Administration3
- Waterborne Commerce Statistics Center (U.S.)3
- Federal Highway Administration, Office of Planning, Environment, & Realty2
- Federal Transit Administration (FTA)2
- Institute for Water Resources (U.S.). Navigation Data Center2
- National Oceanographic and Atmospheric Administration2
- Oak Ridge National Laboratories2
- Strocko, Ed2
- U.S. Army Corps of Engineers2