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Authors
- O'Reilly, Thos. (Thomas), 1827-1901 author1
- O'Shea, M. V. (Michael Vincent), 1866-1932 author1
- O'Shea, M. V. (Michael Vincent), 1866-1932, author4
- O'Sullivan, R. J., author1
- O. E. Miller Treatment Co. author.1
- Obregon y Mayol, Francisco.1
- Obregón, Lauro.1
- Obstetric Institute of Philadelphia.1
- Obstetrical Society of Philadelphia.1
- Ocampo, Ignacio.1
- Ochsner, Albert J. (Albert John), 1858-19251
- Ochsner, Albert J. (Albert John), 1858-1925 author9
- Ochsner, Edward H. (Edward Herman), 1868-1956 author1
- Octerlony, John A. (John Arvid), 1838-19051
- Octerlony, John A. (John Arvid), 1838-1905 author2
- Odell, Frederick S., author1
- Odicini, B. (Bartolomé) author1
- Odontological Society of Pennsylvania, author.1
- Oehme, F. G. (Ferdinand Gustav), 1826-3
- Oertel, Theodore E. (Theodore Eugene), 1864-1933, author1