Hearings Before the Subcommittee on Improvements in Judicial Machinery of the Committee on the Judiciary, United States Senate, Ninetieth Congress, First Session on S. 383, S. 384, S. 385, S. 386, S. 387, S. 389, S. 1319, Proposals to Improve Judicial Machinery for the Selection of Federal Juries, March 21, 22, 29; April 11, 12; May 2, 16; June 6, 28; July 20, 1967