- American Political Items Collectors collection, 1895/19881
- American Public Transportation Association records, 1898/1999136
- American Rhododendron Society Papers
1931-19872
- American Rhododendron Society Printed
Material
ca.
1925-19861
- American Rhododendron Society Records, 1927/20222
- American Theatre Association records1
- American voyage photograph albums, 1904/19391
- Ammen L. Burger, Jr. collection, 1917/19601
- Amos Koontz Papers I, 1809/1965, bulk 1936/19651
- Amos Koontz Papers II, 1865/197021
- Amélie Rives papers, 1930/19838
- Anatole and Vladimir Kalichevsky Papers, 1871/19552
- Ancella Bickley, Historian, Research Papers regarding African-Americans, 1775/2018, bulk 1970/201185
- Anderson Benskin Smith, Sr. Ledgers, 1916/1938, bulk 1916/19361
- Anderson Family papers, 1755/19586