- A. D. Lough correspondence, 1902/19201
- A. H. Hand Papers, 1835/20091
- A. J. Davis Family Collection, 1874/2007, bulk 1874/19071
- A. K. Leake Papers, 1872/19401
- A.B. Stickney, Compiler, Genealogical Materials, 1838/19591
- A.C.L. Gatewood Papers, 1801/19191
- A.D. Hopkins and Josef Brunner, Forest Entomology Correspondence, 1909/19171
- A.J. Morrison Collection, 1754/19751
- A.S. Hammack papers, 1864/19541
- Aaron Chipps, Coal Miner, Papers, 1912/19551
- Aaron Family Collection, 1908/19271
- Abby Edwards diary, 1911/19131
- Abraham Lincoln Collection, 1860/19651
- Abraham Lincoln Ephemera from England, 1909/19301
- Ada Haldeman Ford, Suffragist, Papers, 1900/19701