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The optimum qualifications for apprenticeship in certain allied tradesVan Oot, Benjamin Henry, January 1932 (has links)
Thesis (Ph. D.)--Columbia University, 1932. / Vita. Published also as Bulletin no. 160, Trade and industrial series no. 46, of the U.S. Federal board for vocational education, under title: Apprentice training for shipyard trades; a study of the selection of apprentices ad their progress in training.
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