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Senate Hearing, 92nd Congress - Wider buses and the Interstate Highway System: hearings before the Subcommittee on Roads, of the Committee on Public Works, United States Senate Ninety-second Congress, first and second sessions, on H.R. 4354, an act to amend section 127 of Title 23 of the United States Code relating to vehicle width limitations on the interstate system in order to increase such limitations for motorbuses, December 13, 14, 1971, and February 14, 1972.