- 116th Regiment, Ohio Infantry Sutler Letter, 18632
- 15th Virginia Infantry History, 1861/18642
- 24th Virginia Infantry Records, 18632
- 2nd Regiment, Mississippi Cavalry Confederate Bugler Diary, 1862/18632
- 37th Virginia Infantry Documents, 1863/18642
- A. J. Davis Family Collection, 1874/2007, bulk 1874/19071
- A. M. Allen Letter, 18632
- Aaron Snavely Poem, 18632
- Abel Smith Jr. Letter, 18632
- Adelaide Colcock Papers, 1863/18702
- Adin B. Underwood Papers, 1861/19263
- Admiral Porter's Fleet Running the Rebel Blockade of the Mississippi at Vicksburg, April 16, 1863, 18631
- Aileen B. Cowardin Friendship Book, 1863/18702
- Alexander Floyd Wall Correspondence, 1861/18651
- Alexander McNutt Glasgow Family Papers, 1823/19036