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- Illinois. Department of Public Welfare, author.1
- Illinois. General Assembly. House of Representatives, author.2
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- Imbert, J. B. A.1
- Imbrie, Robert Whitney, 1884-1924, author1
- Imray, Keith.1
- Independent Medical School of Pennsylvania.1
- Indian Herb Doctor, 1830-1903, author1
- Indiana Sanitary and Water Supply Association, author.1
- Indiana Soldiers' and Seamen's Home Association.1
- Indiana State Board of Health, compiler.1
- Indiana State Board of Health, issuing body.1
- Indiana State Medical Association.1
- Infant School & Children's Home (Charlestown, Boston, Mass.)1
- Ingalese, Isabella, author1
- Ingalls, William, 1769-18519
- Ingalls, William, 1813-19031
- Ingals, E. (Ephraim), 1823-19001
- Ingals, E. Fletcher (Ephraim Fletcher), 1848-191824