Labor-management relations in the public sector : hearings before the Special Subcommittee on Labor of the Committee on Education and Labor, House of Representatives, Ninety-second Congress, second session on H.R. 12532, H.R. 7684, H.R. 9324, a bill to provide that employees of states and political subdivisions thereof shall be subject to the provisions of the National Labor Relations Act : hearings held in Washington, D.C., March 8,9, 14, 21; April 12, 13, 18, 26; May 2, and 3, 1972