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Group incentives : some variations in the use of group bonus and gang piece work / by C.C. Balderston.
- 331.2164 B176
- Balderston, C. Canby.
- University of Pennsylvania Press,
- c1930.
- Philadelphia :
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Where the lilies bloom / Vera & Bill Cleaver ; illustrated by Jim Spanfeller.
- 813 C582w, 1969
- Cleaver, Vera.
- J.B. Lippincott Co.,
- ©1969.
- Philadelphia :