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Authors
- Oregon, enacting jurisdiction.3
- Oregon. State Board of Health, author.2
- Oregon. State Board of Health.1
- Organizing Meeting of the Continuation Committee in Medicine and Allied Fields (1940 : United States. Department of State), author1
- Orlansky, Jesse, 1914- author1
- Orr, H. Winnett (Hiram Winnett), 1877-19561
- Osborne, Oliver T. (Oliver Thomas), 1862-1940, author1
- Osgood, L. E., author1
- Osgood, Robert B. (Robert Bayley), 1873-1
- Osler, William, Sir, 1849-19192
- Osler, William, Sir, 1849-1919, author1
- Ottawa Tent Colony (Ottawa, Ill.), author.1
- Ottofy, Louis, 1860- author1
- Overton, Frank, 1867-1