- A. G. Corbin Account Book, 1852/18571
- A. Glass Account Book, 1844/18622
- A. H. Hand Papers, 1835/20092
- A. R. Meenan Letter, 18532
- A. Willis Robertson Papers, 1921/1988, bulk 1946/19663
- Abner Johnson Leavenworth Papers, 1825/18611
- Abolitionist Movement Collection, 1834/18881
- Abraham Grove Account Book, 1815/18501
- Absalom See Account Books, 1854/18691
- Accounts of Unknown Merchant, 1852/18531
- Accounts, 19th Century, 1836/18971
- Adam Empie Papers, 1811/2004, bulk 1811/18501
- Adams Papers, 1782/18902
- Addie Rogers Bound Sheet Music Collection, 1827/18603
- Alabama Collection, 1823/18932