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![Cover for Harvey J. Bertcher · Creating Groups - Sage Human Services Guides (Paperback Book) [2 Revised edition] (1996)](https://imusic.b-cdn.net/images/item/original/922/9780803954922.jpg?harvey-j-bertcher-1996-creating-groups-sage-human-services-guides-paperback-book&class=scaled&v=1662549918)
![Cover for Harvey J. Bertcher · Group Participation: Techniques for Leaders and Members - Sage Human Services Guides (Paperback Book) [2 Revised edition] (1993)](https://imusic.b-cdn.net/images/item/original/140/9780803952140.jpg?harvey-j-bertcher-1993-group-participation-techniques-for-leaders-and-members-sage-human-services-guides-paperback-book&class=scaled&v=1624561010)