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House Hearing, 90th Congress - Standardizing the sizes of mail. Part II: Hearings before the Subcommittee on Postal Rates of the Committee on Post Office and Civil Service, House of Representatives, Ninetieth Congress, second session, on H.R. 14029, a bill to fix additional postage charges for certain nonstandard mail, and for other purposes. February 28; March 20, 28; April 2; July 16, 17, and 30, 1968.