- 19th Century Virginia albumen photographs, 1880/18991
- 6th Battery of Binghamton, N.Y. Veterans minute book, 1871/19111
- A. H. Hand Papers, 1835/20091
- A. K. Leake Papers, 1872/19401
- A.P. Woodward Records, 1886/19071
- Account Ledger and Diary (Upstate New York), 1886/1907, bulk 1890/19001
- Accounts, 19th Century, 1836/18971
- Adam Empie Papers, 1811/2004, bulk 1811/18501
- Addison Family Papers, 1890/18991
- African American Family Photographs, 1880/19601
- African American Stereoview Collection, 1860/19011
- Albert C. Swindler Papers, 1862/1929, bulk 1862/18641
- Alexander Brown Papers (I), 1815/19101
- Alexander Brown Papers (II), 1748/19001
- Alfred E. Bradley Papers, 1864/1922, bulk 1916/19181