- Abigail Brown Shaw Cole diary, 1859/18691
- Absalom See Account Books, 1854/18691
- Account book (N.H.), 1856/18741
- Adam Empie Papers, 1811/2004, bulk 1811/18501
- Adam F. Carpenter Letter, 18631
- Adam and Wayman Collins Confederate Vouchers, 1862/18641
- Adams Papers, 1782/18901
- Adee Family Papers, 1862/18651
- Adelaide Colcock Papers, 1863/18701
- Adin B. Underwood Papers,, 1861/19262
- Administration records collection, 1776/197611
- Aileen B. Cowardin Friendship Book,, 1863/18701
- Aileen Shafer, Collector, Material regarding African-Americans, 1829/18844
- Alabama Collection, 1823/18931
- Albert C. Swindler Papers, 1862/1929, bulk 1862/18641