- Alexander Von Humboldt Portrait Print, 1855/18901
- Alfred Thompson Correspondence, 1862/18632
- Allen J. Clifton Correspondence, 18632
- Allison Family Correspondence, 1862/18642
- Alonzo D. Cushing Letters, 1861/18642
- Amon W. Updike Correspondence, 1861/18652
- Andrew Given Family Correspondence, 1859/18861
- Andrew J. Lewis Correspondence, 1863/18652
- Ann A. Hertzler Collection, 1863/2013, bulk 1974/20003
- Anna Burton Ellett Collection, 1751/19321
- Antoine Gaujot and Julien E. Gaujot Papers, 1840/19992
- Approaches to Vicksburg - 1863 (Reproduction), 18631
- Association for the Preservation of Virginia Antiquities, Montgomery County Branch Papers, 1754/1996, bulk 1958/19831
- Atwell W. Robertson Letter, 18632
- August Dietz Civil War Collection, 1862/19093