00474nam a2200157Ia 4500001001100000005001700011008003500028020001500063090001000078245007600088260004000164300002500204504003000229504004200259999001500301000002142420251012174640.0  901115s1972    xxx           000  a080961846X04a361.410aSocial group workbprinciples and practicesc[by] Harleigh B. Trecker.   aNew YorkbAssociation Pressc1972.   a350p.billus.c24cm.  aBibliography, p.329-344.   aIncludes bibliographical references.   c8026d8026