- A. Philip Randolph, Civil Rights and Labor Leader, Papers, 1919/19371
- A.B. Stickney, Compiler, Genealogical Materials, 1838/19591
- Aaron Chipps, Coal Miner, Papers, 1912/19551
- Ada Haldeman Ford, Suffragist, Papers, 1900/19701
- Adamston Flat Glass Factory, Glass Cutting Tool, 1910/19301
- Adolphus DeBussey, Soldier, Civil War Letters, 1861/1998, bulk 1861/18711
- Adolphus P. Howard Papers, 1850/19381
- African American Photographic Portraits, 1880/19531
- Agnes Smith (1906-1994), Author, Correspondence, Manuscripts, and Publications, 1920/19701
- Alan Clarke Railroad Research Papers, 1861/20121
- Albert Blakeslee White (1856-1941) Papers, 1888/19291
- Albert M. Reese (1872-1965) Papers, 1873/19541
- Albert M. Reese (1872-1965) Papers, 1907/19541
- Albert Moore Reese, Zoology Professor, Miscellaneous Items, 1900/19701
- Alexander Foreman, Photographer, Glass Plate Negatives, 1890/19251