00485nam^a2200169^a^450000100100000000500170001000800410002704000240006804100080009208200160010010000250011624500740014125000110021526000470022630000110027370000310028400000139020260502230103.0^^^^^^s1969||||ag-|||||||||||||||e|spa|d  aANC-BCbspacANC-BC  aspa04a374.21 TREt1 aTrecker, Harleigh B.13aEl trabajo social en grupos /cHarleigh B. Trecker, Audrey R. Trecker  a1a. ed  aBuenos Aires :bBibliografica Omeba,c1969  a166 p.1 aTrecker, Audrey R,ecoaut.