[Committee publication] serial, 94th Congress. 25. Clean air act amendments, 1975, hearings, pt. 1, before Subcommittee on Health and Environment, 94th Congress, 1st session, on tides 5 and 6 of H.R.2633 and H.R.2650 and all other bills which amend Clean air act. Mar. 13-26, 1975.