Supplemental air service : hearings before the Subcommittee on Aviation of the Committee on Interstate and Foreign Commerce, United States Senate, Eighty fifth Congress, first session, on proposed legislation by the Civil Aeronautics Board to amend the Civil Aeronautics Act of 1938, as amended, to authorize the Civil Aeronautics Board to include in certificates of public convenience and necessity limitations on the type and extent of service authorized, and for other purposes. April 4 and 5, 1957.

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