The metal machining trades in Philadelphia
Subtitle: an occupational survey ...
By: [by] Irving Lewis Horowitz.
Published: 1939
Place of publication: Philadelphia
Language: eng
Number of pages: 129
Subjects: Machinists -- Pennsylvania -- Philadelphia.; Machine-shop practice.; Vocational education.
Notes: Thesis (Ph. D.)--University of Pennsylvania, 1939.
Bibliography: p. 125-129.