- Adele Blow Chatfield-Taylor family papers, 1899/197714
- Adele Goodman Clark papers, 1849/197835
- Adin B. Underwood Papers, 1861/19262
- Administration records collection, 1776/19769
- Adolphus DeBussey, Soldier, Civil War Letters, 1861/1998, bulk 1861/18712
- Adolphus P. Howard Papers, 1850/19381
- Advertisement Trade Card for "Quignon-Rombach", 1880/19201
- Advisory Committee Research Collection, 1772/201715
- Affidavits for Ardent Spirits Collection, 1916/191719
- African American Family Photographs, 1880/19601
- African American Family photograph album, 1910/19602
- African American Hugh Carr family, River View Farm, and the Papers of the Ivy Creek Foundation, 1916/19882
- African American Photographic Portraits, 1880/19531
- African and African American photograph collection, 1850/19452
- Al Gross Papers, 1909/20001