- Anne Price Yates Papers II, 1898/20052
- Annie M. Hale Sheet Music Collection, 1892/19874
- Antoine Gaujot and Julien E. Gaujot Papers, 1840/19995
- Appalachian Electric Power Company Photographs, 1931/19562
- Architectural League of New York: Archive of Women in Architecture Records, 1892/19765
- Armed Services Edition Collection, 1913/19451
- Arthur B. Massey Papers, 1902/19614
- Arthur M. Squires Papers, 1888/1987, bulk 1940/198762
- Arthur W. Grove Family Papers,, 1900/19572
- Association for Women in Architecture Records, 1928/19925
- Association for the Preservation of Virginia Antiquities, Montgomery County Branch Papers, 1754/1996, bulk 1958/19835
- Avery-Abex Metallurgical Collection, 1920/19871
- Aviation Brochures and Pamphlets Collection,, 1910/19583
- Bailey-Law Collection, 1825/1971175
- Baughman Family Papers, 1837/19685