- Adam Rinica and George Rinica Account Book, 1822/18482
- Adams Papers, 1782/18902
- Addie Rogers Bound Sheet Music Collection, 1827/18603
- Administration records collection, 1776/19764
- Admiral John Randolph Tucker Papers, 1865/18972
- Aileen Shafer, Collector, Material regarding African-Americans, 1829/18845
- Alabama Collection, 1823/18932
- Albert R. Gallatin papers, 1795/18281
- Alderman family papers, 1779/19614
- Alexander Brown Papers (I), 1815/19103
- Alexander Brown Papers (II), 1748/19001
- Alexander Family Papers
1800-18908
- Alexander Haight family collection, 1764/19762
- Alexander Haight family collection, 1764/19773
- Alexander Hamilton, Jr. Letters, 1832/18332