- 10th Regiment, New Jersey Infantry/Confederate Soldier Diary, 18641
- 2nd Regiment, Mississippi Cavalry Confederate Bugler Diary, 1862/18631
- 398th United States Army Air Force Bombardment Squadron Collection, 1944/19451
- A. E. C. Hughes Diary, 18661
- Abigail Brown Shaw Cole diary, 1859/18691
- Account Ledger and Diary (Upstate New York), 1886/1907, bulk 1890/19001
- Acker Family Diaries, 1880/19061
- Agnes Wullenwaber Diary, 1938/19421
- Albert D. Davis papers, 1930/19521
- Alexander Sterrett Paxton Papers, 1858/1959, bulk 1861/18651
- Alfred Washington Drinkard, Jr. Diary, 19471
- Alice Daphne Petty diary, 1933/19341
- Alma Fontaine Papers, 1923/19261
- Alpha Spitzer Travel Diary, 19391
- Alva Cleveland Diary, 18621