- A. Meyer Civil War letter, 18631
- A. S. Lara papers, 1856/18611
- A. Willis Robertson Papers, 1921/1988, bulk 1946/19663
- A.B. Stickney, Compiler, Genealogical Materials, 1838/19591
- A.C.L. Gatewood Papers, 1801/19191
- A.J. Lawrence Account Book, 1857/18832
- A.J. Morrison Collection, 1754/19751
- A.N. Missimer, Soldier, Civil War Letter to Sister, 18631
- Aaron Snavely Poem, 18632
- Abel Smith Jr. Letter, 18632
- Abigail Brown Shaw Cole diary, 1859/18692
- Abner Osburn, Physician, Papers, 1846/19011
- Abolitionist Movement Collection, 1834/18881
- Abraham Lincoln Collection, 1860/19651
- Absalom See Account Books, 1854/18692