English
Thesis (PH. D.)--University of Pennslyvania, 1930 · "Reprints from the Journal of applied psychology, vol. 13, no. 6, and vol. 14, no. 1." · "References": p. 71-73 · Microfilm · Master negative: 95-82379-1 · No. 1 on a reel of 13 titles · Filmed;
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