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- United States. Bureau of Transportation Statistics15
- United States. Department of Transportation. Research and Innovative Technology Administration2
- United States. Federal Highway Administration.2
- Digital Social Science Center (DSSC), Columbia University Libraries1
- Federal Transit Administration (FTA)1
- National Renewable Energy Laboratory (U.S.)1
- Research and Innovative Technology Administration's Bureau of Transportation Statistics (RITA/BTS)1
- United States. Army. Corps of Engineers.1
- United States. Federal Transit Administration.1