- A.J. Morrison Collection, 1754/19751
- A.S. Hammack papers, 1864/19541
- Aaron Chipps, Coal Miner, Papers, 1912/19551
- Abbot E. Smith Papers, 1930/19391
- Abraham Johnson Family Genealogy, 1930/19391
- Abraham Lincoln Collection, 1860/19651
- Abraham Lincoln Ephemera from England, 1909/19301
- Ada Haldeman Ford, Suffragist, Papers, 1900/19701
- Adalbert J. Volck Collection of Etchings, 1861/19791
- Adam Empie Papers, 1811/2004, bulk 1811/18501
- Adam Finch Collection, 1891/19331
- Adams T. Rice papers, 1922/19602
- Adamston Flat Glass Factory, Glass Cutting Tool, 1910/19301
- Addison H. Smith papers, 1917/1970, bulk 1917/19221
- Adele Blow Chatfield-Taylor family papers, 1899/19771