U.S. international trade and freight transportation trends /
Bureau of Transportation Statistics.
Washington, DC : U.S. Department of Transportation, Bureau of Transportation Statistics, 
Freight and freightage > Freight and freightage / United States > Freight and freightage / United States / Security measures.
Exports > Exports / United States.
Imports > Imports / United States.
Freight and freightage > Freight and freightage / United States.
United States > United States / Commerce > United States / Commerce / Statistics.
v, 147 p. :
ill., map, charts ;
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