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House Hearing, 91st Congress - Civil Aeronautics Board air mail rate authority: hearings before the Subcommittee on Transportation and Aeronautics of the Committee on Interstate and Foreign Commerce, House of Representative, Ninety-first Congress, second session, on H.R. 16879, a bill to amend the Federal Aviation Act of 1958 to provide for the establishment of mail rates by the filing of tariffs, and for other purposes, April 14 and 15, 1970.