[Committee hearing] serial, 92d Congress. 79. Transportation act of 1972, pt. 4, hearings before Subcommittee on Transportation and Aeronautics, 92d Congress, 2d session, on H.R. 11824, H.R. 11826, and H.R. 11207 (and all identical Mils), Mar. 27-May 12, 1972.