| Abbreviation | Definition |
|---|---|
| AUP | Aberdeen University Press |
| AUSMC | Archives of the University of St. Michael's College, Toronto |
| AVBL | Apple Valley Branch Library |
| AVRIL | A Virtual Reality Interface Library |
| AVRL | Adult Vaccination Resources Library |
| AVRL | Annapolis Valley Regional Library |
| AWL | Andrews Web Libraries |
| B&B | Bird and Bull [Press] |
| B&BP | Bird and Bull Press |
| BA | Boston Athenaeum |
| BACLA | Boroughbridge Area Community Library Association |
| BAIL | Becket Athenaeum Inc Library |
| BAK | Bundesarchiv Koblenz |
| BALC | Baltimore Academic Libraries Consortium |
| BALC | Baltimore Academic Library Consortium |
| BARD | Braille and Audio Recorded Download |
| BARD | Briefing And Reference Database |
| BBML | British Balloon Museum and Library |
| BBW | Banned Books Week |
| BCBL | Battle Command Battle Library |