| AAPG Datapages | |
| ABC-CLIO eBook Collection | |
| ABI/INFORM Archive Complete (1905-1985) | |
| ABI/INFORM Dateline (1985-) | |
| ABI/INFORM Global (1971-) | |
| ABI/INFORM Trade & Industry (1971-) | |
| Academic Search Complete (1865-) | |
| Academic Universe | |
| AccessEngineering | |
| AccessPharmacy | |
| AccessScience | |
| Accounting & Tax | |
| ACM Digital Library (1958-) | |
| ACS Publications | |
| Acta Sanctorum | |
| African American Music Reference (1800-) | |
| African American Newspapers (1827-1902) | |
| African American Newspapers, 1827-1998 | |
| African American Poetry (1750-1900) | |
| African Studies Companion | |
| African Writers Series (1962-2003) | |
| AgeLine (1978-) | |
| AGRICOLA (1970-) | |
| Aluka | |
| America, History and Life (1964-) | |
| American Broadsides and Ephemera, Series I | |
| American Civil War: Letters and Diaries (1855-1875) | |
| American Drama 1714-1915 (1714-1915) | |
| American History in Video | |
| American Periodicals from the Center for Research Libraries (1741-1941) | |
| American Periodicals Series Online (1740-1900) | |
| American Poetry (1600-1950) | |
| American Slavery (1860-1938) | |
| American Song | |
| Annual Bibliography of English Language and Literature (1920-) | |
| AnthroSource | |
| APA Review of Books (2004-) | |
| Architecture.com (1984-) | |
| Art Full Text (1984-) | |
| Art Index Retrospective (1929-1984) | |
| Art Museum Image Gallery (ca. 3000 B.C.-) | |
| Artbibliographies Modern (1974-) | |
| Arte Publico Hispanic Historical Collection, Series 1 | |
| ARTFL Project (1200-1900s) | |
| ArticleFirst (1990-) | |
| Arts & Humanities Citation Index (1955-) | |
| ARTstor | |
| arXiv.org (1991-) | |
| ASCE Research Library | |
| Atlanta Constitution (1868-1942) | |
| Atlanta Daily World (1931-2003) | |
| Avery Index to Architectural Periodicals (1934-) | |
