000 003480000a22001570004500
020 _a0134646363
060 _a100
082 _a302. 34 WIL
100 _aWilson, Stephen
245 _aInformal groups: an introduction
260 _aU S A, Prentice -Hall Inc
260 _c1978
300 _a305
650 _aInformal groups
942 _cBK
999 _c361285
_d361285