- A. Willis Robertson Papers, 1921/1988, bulk 1946/196614
- A.B. Stickney, Compiler, Genealogical Materials, 1838/19591
- A.J. Morrison Collection, 1754/19751
- A.S. Hammack papers, 1864/195412
- Aaron Chipps, Coal Miner, Papers, 1912/19551
- Abbot E. Smith Papers, 1930/19393
- Abraham Anson papers, 1939/20052
- Abraham Johnson Family Genealogy, 1930/19391
- Abraham Lincoln Collection, 1860/19651
- Abraham Lincoln Ephemera from England, 1909/19301
- Academic Departments - Record Group 91
- Ackerly Family Papers20
- Ada Haldeman Ford, Suffragist, Papers, 1900/19701
- Adalbert J. Volck Collection of Etchings, 1861/19794
- Adam Empie Papers, 1811/2004, bulk 1811/18503