- 17th and 18th century British periodicals, 1600/18001
- A Map of the Country Between Albemarle Sound and Lake Erie, Comprehending the Whole of Virginia, Maryland, Delaware, and Pennsylvania., 17871
- A.J. Morrison Collection, 1754/19751
- Account Books, 1782/18951
- Adams Papers, 1782/18901
- Administration records collection, 1776/19761
- Advisory Committee Research Collection, 1772/20171
- Alderman family papers, 1779/19611
- Alex Welch Survey Papers, 1786/18011
- Alexander Balmaine Memorandum Book, 1775/18201
- Alexander Brown Papers (II), 1748/19001
- Alexander Haight family collection, 1764/19761
- Alexander Haight family collection, 1764/19771
- Alexander, Fultz, and Willson Families Collection, 1770/19701
- Alexandria History Collection (MS240), 1767/20081