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- United States. Bureau of Transportation Statistics10
- United States. Federal Highway Administration3
- United States. Federal Aviation Administration2
- Vanderbilt Engineering Center for Transportation Operations and Research2
- Waterborne Commerce Statistics Center (U.S.)2
- Beningo, Steve1
- Blades, Doug1
- Liu, Zhi1
- Lubkin, Samantha 1
- United States. Bureau of Customs and Border Protection1
- United States. Federal Highway Administration. Office of Highway Policy Information1