- Andrew Monroe Cridler Papers, 1871-1913, n.d.1
- Anne McClung Collection, 1844/19661
- Archer Lawrie Sheet Music Collection, 1879/19351
- Armistead-Cocke Papers, 1680/19171
- Arthur Fickénscher Papers
ca.
1895-19955
- Arthur J. Morris memorabilia, 1884/19921
- Arthur S. Dayton Correspondence and Catalogs regarding Purchase of Rare Books, 1898/2007, bulk 1923/19593
- Atchison Union Depot & Railroad Company photograph collection1
- Atkeson-Morgan Family Papers, 1833/1923, bulk 1850/19001
- Aubrey E. Strode papers, 1861/19691
- Augustus C. Golding Papers, 1859/1934, bulk 1862/18641
- Bailey-Law Collection, 1825/197132
- Barringer Family Papers
ca.
1812-196614
- Basil Lanneau Gildersleeve Papers
1799-198916
- Baylor Family Papers
1653-19159