- Academic Departments - Record Group 91
- Account Booklets with John W. Crist, 1895/19092
- Account Ledger and Diary (Upstate New York), 1886/1907, bulk 1890/19002
- Acker Family Diaries, 1880/19063
- Ackerly Family Papers10
- Ada Haldeman Ford, Suffragist, Papers, 1900/19701
- Adalbert J. Volck Collection of Etchings, 1861/19794
- Adam Empie Papers, 1811/2004, bulk 1811/18502
- Adam Finch Collection, 1891/19332
- Adam T. Finch Papers, 1895/19262
- Adele Blow Chatfield-Taylor family papers, 1899/197710
- Adele Goodman Clark papers, 1849/197810
- Adin B. Underwood Papers, 1861/19262
- Administration records collection, 1776/197614
- Adolphus DeBussey, Soldier, Civil War Letters, 1861/1998, bulk 1861/18712