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- 40004169 contributor B957075.
- 40004169 created "1939.".
- 40004169 date "1939".
- 40004169 date "1939.".
- 40004169 dateCopyrighted "1939.".
- 40004169 description "Bibliography: p. 125-129.".
- 40004169 description "Thesis (Ph. D.)--University of Pennsylvania, 1939.".
- 40004169 extent "129 p. incl. tables, diagrs.".
- 40004169 issued "1939".
- 40004169 issued "1939.".
- 40004169 language "eng".
- 40004169 publisher "Philadelphia,".
- 40004169 spatial "Pennsylvania Philadelphia.".
- 40004169 subject "331.762175".
- 40004169 subject "HD8039.M22 H58 1939".
- 40004169 subject "Machine-shop practice.".
- 40004169 subject "Machinists Pennsylvania Philadelphia.".
- 40004169 subject "Vocational education.".
- 40004169 title "The metal machining trades in Philadelphia; an occupational survey ... [by] Irving Lewis Horowitz.".
- 40004169 type "text".