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Author
- United States. Bureau of Transportation Statistics5
- Hart Energy Publishing2
- TTG, Inc.2
- Beningo, Steve1
- Blades, Doug1
- Liu, Zhi1
- Lubkin, Samantha 1
- United States. Bureau of Customs and Border Protection1
- United States. Federal Aviation Administration1
- United States. Federal Highway Administration1
- Vanderbilt Engineering Center for Transportation Operations and Research1
- Waterborne Commerce Statistics Center (U.S.)1