Hazardous materials transportation : independent safety board act amendments : joint hearings before the Subcommittee on Aviation and the Subcommittee on Surface Transportation of the Committee on Public Works and Transportation, House of Representatives, Ninety fifth Congress, second session, on H.R. 11871 and H.R. 11872 ... H.R. 12106 ... April 19 and 20, 1978.

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