- 19th Century Virginia albumen photographs, 1880/18993
- 6th Battery of Binghamton, N.Y. Veterans minute book, 1871/19112
- A. H. Hand Papers, 1835/20092
- A. K. Leake Papers, 1872/19403
- A. Willis Robertson Papers, 1921/1988, bulk 1946/19664
- A.P. Woodward Records, 1886/19072
- Account Ledger and Diary (Upstate New York), 1886/1907, bulk 1890/19002
- Accounts, 19th Century, 1836/18971
- Adam Empie Papers, 1811/2004, bulk 1811/18503
- Addison Family Papers, 1890/18992
- African American Family Photographs, 1880/19602
- African American Stereoview Collection, 1860/19013
- Alabama Collection, 1823/18932
- Albert C. Swindler Papers, 1862/1929, bulk 1862/18642
- Alexander Brown Papers (I), 1815/191011