- 6th Battery of Binghamton, N.Y. Veterans minute book, 1871/19112
- A. H. Hand Papers, 1835/20092
- A. K. Leake Papers, 1872/19402
- A. Willis Robertson Papers, 1921/1988, bulk 1946/19665
- A.P. Woodward Records, 1886/19072
- Account Ledger and Diary (Upstate New York), 1886/1907, bulk 1890/19002
- Ada E. Boyle Photograph Album, 19051
- Adam Empie Papers, 1811/2004, bulk 1811/18502
- Adele Blow Chatfield-Taylor family papers, 1899/19779
- African American Family Photographs, 1880/19601
- African American and Hampton Normal Institute Postcards, 1897/19132
- Albert C. Swindler Papers, 1862/1929, bulk 1862/18642
- Alexander Brown Papers (I), 1815/19101
- Alexander Hamilton, Jr. Letters, 1832/18331
- Alfred E. Bradley Papers, 1864/1922, bulk 1916/19181