Study of piggyback trailers :
report of the Secretary of Transportation to the United States Congress pursuant to Section 936 of the Deficit Reduction Act of 1984.
Washington, D.C. : Federal Highway Administration, 
Roads > Roads / Finance.
Trailer on flat car.
Piggyback transportation > Piggyback transportation / Taxation > Piggyback transportation / Taxation / United States.
Roads > Roads / United States > Roads / United States / Finance.
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