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Author
- Bureau of Transportation Statistics (BTS)8
- ICF Consulting6
- Bureau of Transportation Statistics (comp.)5
- Bureau of Transportation Statistics4
- Bureau of Transporation Statistics (BTS)2
- Federal Aviation Administration (Aeronautical Information Services, ATA-100)2
- US Army Corps of Engineers (USACE)2
- Vanderbilt Engineering Center forTransportation Operations and Research Vanderbilt University2
- US Bureau of the Census (BOC)1