003420000a22001450004500020001500000060000800015082001900023100001700042245003700059250000600096260002900102260000900131300000800140650004800148  a0029138418  a100  a302.340 72 HAR  aHare, Paul A  aHandbook of small group research  a2  aNew York, The free press  c1962  a781  aSmall groups-  research/ social interaction