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People
Creators
- O'Brien & Gere
- O'Brien & Gere Engineers, Inc.
- O'Brien & Grere Engineers, Inc.
- O'Connell, R. L.; Walters, C. M.
- O'Connor, Donald J.
- O'Day, D. Kelly
- O'Day, D. Kelly; Staeheli, Lynn A.
- Odell, Peter N.
- Office of Resources Management, Bureau of Water Resources Management
- Office of the City Representative
- Office of the City Representative, City of Philadelphia
- Office of Watersheds, Philadelphia Water Department
- Official Philadelphia Fire Department Photo
- Ogdin, Samuel
- O'Gorman, James F.
- O'Keeffe, John
- Okun, Daniel A.
- Oliver, Bruce R.
- Olmsted, Frederick Law
- O'Rourke, Michal
- Osborne, M., engraver (after painting by Bartlett, William H.)
- Osborne, Percy T.
- Osbourn, H. V. B.
- O'Shaughnessey, Jerry
- O'Shaughnessy, F. R.
- Ott, C. H.
- Ott, C. H. asst. eng. and Meus, Percy, draftsman.
- Ough, Henry
- Ouviere, Felix Pascalis
- Oyama, Susan
- Ozone Processes, Incorporated