- A.J. Lawrence Account Book, 1857/18832
- A.J. Morrison Collection, 1754/19751
- A.S. Hammack papers, 1864/19541
- Abner Osburn, Physician, Papers, 1846/19011
- Abolitionist Movement Collection, 1834/18881
- Abraham Lincoln Collection, 1860/19651
- Absalom See Account Books, 1854/18691
- Account Books, 1782/18954
- Account book (N.H.), 1856/18742
- Accounts, 19th Century, 1836/18971
- Ackerly Family Papers6
- Adalbert J. Volck Collection of Etchings, 1861/19792
- Adam Empie Papers, 1811/2004, bulk 1811/18503
- Adams Papers, 1782/18902
- Address about William & Mary, 18702