| Abbreviation | Definition |
|---|---|
| ASD | COLLOQUIALISM FOR 'aced' |
| ASDL | Analytical Sciences Digital Library |
| ASIS | American Society for Information Science |
| ASL | Adobe Source Libraries |
| ASLFC | Associated School Librarians of Fairfax County |
| ASLIB | Association of Special Libraries and Information Bureaux |
| ASLIB | Association of Special Libraries Information Bureau |
| ASLN | Alaska State Library Newspapers |
| ASLP | Association of Special Libraries of the Philippines |
| ASLS | Academic and Special Libraries Section |
| ASSL | Arts and Social Sciences Library |
| ASSL | Arts and Social Studies Library |
| ASSL | Astrophysics and Space Science Library |
| ATBL | American Trust for the British Library |
| ATCL | At the Circulating Library |
| ATLAS | American Theological Library Association Serials |
| ATPL | Abington Township Public Library |
| AU | Author |
| AUBP | AUBurn Public Library |
| AUO | Archives of the University of Ottawa |