Text ( visual ) : unmediated Developing people in industry : principles and methods of training / Douglas H. Fryer, Mortimer R. Feinberg, Sheldon S. Zalkind. -- New York : Harper & Bros. , c1956. -- xii, 210 p. : ill. ; 22 cm. -- Includes bibliographical references and index. -- (BA4364339X) ; https://ci.nii.ac.jp/ncid/BA4364339X Author Heading(s): Fryer, Douglas Henry ; Feinberg, Mortimer R. ; Zalkind, Sheldon S.

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