Suggested Topics within your search.
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Science and engineering--Pennsylvania--Philadelphia--20th century
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Bessemer process
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Business--History--Pennsylvania--Philadelphia--20th century
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Clubs and Associations--Philadelphia--20th century
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Engineering--Problems, exercises, etc
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Philadelphia (Pa.)--History--20th century
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Railroad engineering
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Dwyer family
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“...Science and engineering--Pennsylvania--Philadelphia--20th century Local sources...”
Record Source:
Archival Materials
Link to finding aid
Manuscript