- A. H. Hand Papers, 1835/20092
- A. Willis Robertson Papers, 1921/1988, bulk 1946/19663
- A.J. Lawrence Account Book, 1857/18832
- Abigail Brown Shaw Cole diary, 1859/18692
- Abolitionist Movement Collection, 1834/18881
- Absalom See Account Books, 1854/18692
- Account Book Including Recipes and Home Remedies, 1856/18691
- Account book (N.H.), 1856/18742
- Accounts, 19th Century, 1836/18971
- Adam Empie Papers, 1811/2004, bulk 1811/18503
- Adams Papers, 1782/18902
- African American Stereoview Collection, 1860/19011
- African Qur'an Manuscript, 18691
- Alabama Collection, 1823/18932
- Albert C. Swindler Papers, 1862/1929, bulk 1862/18642