Museum Services Act : hearings before the Select Subcommittee on Education of the Committee on Education and Labor, House of Representatives, Ninety-second Congress, second session on H.R. 8677, a bill to provide for the Secretary of the Department of Health, Education, and Welfare to assist in the improvement and operation of museums : hearings held in Washington, D.C., September 19, 1972, and Chicago, Ill., September 23, 1972