Hearings Before the Committee on Post Office and Civil Service, House of Representatives, Eighty-seventh Congress, First Session, on H. R. 6418, a Bill to Readjust Postal Rates, and for Other Purposes. April 25, 26, 27; May 2, 3, 9, 10, 11, 16, 17, 18, 23, 24, 25; June 1, 6, 7, 1961