Other
- Engineering firms--United States 1 results
- Engineering proceedings 1 results
- Engineering--Education 1 results
- Engineering--Pennsylvania 1 results
- Engineering--Pennsylvania--Philadelphia 1 results
- Engineering--Problems, exercises, etc 1 results
- Engineering--Social aspects--United States 1 results
- Engineering--Societies, etc 1 results
- Philadelphia (Pa.)--Social conditions--20th century 1 results