Books by Earl Planty:
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Planty, Earl: Developing Management Ability: 600 Questions and Answers (New York: Ronald Press, c1954), also by J. Thomas Freeston (page images at HathiTrust)
Additional books by Earl Planty in the extended shelves:
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Planty, Earl: Training activities in the state governments (Public Personnel Association, 1962), also by George Kanawaty (page images at HathiTrust)- Planty, Earl: Training employees and managers for production and teamwork (Ronald Press Co., 1948), also by Carlos A. Efferson and William S. McCord (page images at HathiTrust)
Find more by Earl Planty at your library, or elsewhere.