- Abner Johnson Leavenworth Papers, 1825/18611
- Abner Osburn, Physician, Papers, 1846/19011
- Abolitionist Movement Collection, 1834/18881
- Abraham Lincoln Collection, 1860/19651
- Abram Mason Memoir [Xerox], 18601
- Absalom See Account Books, 1854/18693
- Account Book Including Recipes and Home Remedies, 1856/18691
- Account Books, 1782/18953
- Account book (N.H.), 1856/18742
- Accounts, 19th Century, 1836/18971
- Ackerly Family Papers4
- Adam Empie Papers, 1811/2004, bulk 1811/18502
- Adams Papers, 1782/18902
- Addie Rogers Bound Sheet Music Collection, 1827/18603
- Adele Goodman Clark papers, 1849/19784