00502nam a2200169Ia 4500 0000005770 20251012174443.0 730213s1961 dcua b 000 0 eng HM131 .B68 301.151 Group development. Washington, National Training Laboratories, National Education Association 1961. vi, 106 p diagrs 23 cm. Includes bibliographies. Group relations training. Small groups. 3764 3764 0 0 0 0 KEM KEM 2012-12-07 0 0000003207 2025-10-12 08:34:43 2025-10-12 OS