- "Young Eph's Lament" Song Sheet, 1850/18991
- A. E. Dick Howard papers, 1928/20171
- A. Gold and Company ledgers, 1866/18801
- A. H. Hand Papers, 1835/20091
- A. J. Davis Family Collection, 1874/2007, bulk 1874/19071
- A. S. Lara papers, 1856/18611
- A. Willis Robertson Papers, 1921/1988, bulk 1946/19663
- A.J. Lawrence Account Book, 1857/18831
- Abigail Brown Shaw Cole diary, 1859/18691
- Absalom See Account Books, 1854/18691
- Account book (N.H.), 1856/18741
- Adalbert J. Volck Collection of Etchings, 1861/19791
- Adam Empie Papers, 1811/2004, bulk 1811/18502
- Adams Papers, 1782/18901
- Adelaide Colcock Papers, 1863/18701