- A. H. Hand Papers, 1835/20091
- A. K. Leake Papers, 1872/19401
- A. Willis Robertson Papers, 1921/1988, bulk 1946/19663
- A.J. Lawrence Account Book, 1857/18831
- Absalom See Account Books, 1854/18691
- Account book (N.H.), 1856/18741
- Adam Empie Papers, 1811/2004, bulk 1811/18502
- Adams Papers, 1782/18901
- Address about William & Mary, 18701
- Alabama Collection, 1823/18931
- Albert C. Swindler Papers, 1862/1929, bulk 1862/18641
- Alexander Brown Papers (I), 1815/19109
- Alexander Brown Papers (II), 1748/19007
- Alexander Hamilton, Jr. Letters, 1832/18331
- Alexander M. Davis Papers, 1850/18923