- A. & R. Fisher Paper Company Ledger, 1840/18511
- A. Glass Account Book, 1844/18621
- A. Miley Journal, 1843/18451
- A.C.L. Gatewood Papers, 1801/19191
- Abner Johnson Leavenworth Papers, 1825/18611
- Adam Empie Papers, 1811/2004, bulk 1811/18501
- Adam Rinica and George Rinica Account Book, 1822/18481
- Alexander Brown Papers (I), 1815/19101
- Alexander Haight family collection, 1764/19761
- Alexander Hugh Holmes Stuart Account Books, 1837/18571
- Amos Johnson Ledgers, 1808/1861, bulk 1808/18211
- Amos Koontz Papers I, 1809/1965, bulk 1936/19651
- Archibald Stuart Ledgers, 1757/18521
- Armistead-Cocke Papers, 1680/19171
- Arthur I. Boreman Papers, 1830/19491