Collection
- Abortion Care Network records, 2007-2012 and undated1
- Abortion Conversation Project records, 2000-20081
- Abortion Rights Association, Inc., photographs and pamphlets, 1972-1974 and undated1
- Abraham Hanson papers, 1840-1866 and undated1
- Abraham Joshua Heschel papers, 1880, 1919-1998 and undated1
- Abraham Rand Thompson letter, Charlestown, Massachusetts, to Loammi Baldwin, Esq., Norfolk, Virginia, 1833, June 71
- Abraham Zacarías López Penha letters, 1894-1925 and undated1
- Abram Kanof papers, 1858-1996 and undated, bulk 1928-19911
- Academic Council records, 1954-20001
- Academic Rankings Reference collection, 1980-[ongoing]1
- Academics and Research Reference collection, 1851-ongoing1
- Activating the Archive student projects collection, 20151
- Ada Lovelace Letter, August 5, [1841 or 1847]1
- Adam Reynolds photographs, 2013-20151
- Adamos manuscript, undated1
- Addison "Add" Penfield papers, 19851
- Adelaide Johnson papers, 1884-1945 and undated1
- Adeline Burr Davis Green papers, 1796-19561
- Aden Field papers, 1940s-20151
- Administrative Council records, 1959 - 19691