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- catalog contributor b7514362.
- catalog created "1939.".
- catalog date "1939".
- catalog date "1939.".
- catalog dateCopyrighted "1939.".
- catalog description "Bibliography: p. 125-129.".
- catalog description "Thesis (PH.D.)--University of Pennsylvania, 1939.".
- catalog extent "129 p.".
- catalog issued "1939".
- catalog issued "1939.".
- catalog language "eng".
- catalog publisher "Philadelphia,".
- catalog spatial "Pennsylvania Philadelphia.".
- catalog subject "331.762175".
- catalog subject "HD8039.M22 H58 1939".
- catalog subject "Machine-shop practice.".
- catalog subject "Machinists Pennsylvania Philadelphia.".
- catalog subject "Vocational education.".
- catalog title "The metal machining trades in Philadelphia; an occupational survey ... [by] Irving Lewis Horowitz.".
- catalog type "text".