| Abbreviation | Definition |
|---|---|
| ArchMalProf | Archives des Maladies Professionnelles de Medecine du Travail et de Securite Sociale (Paris) |
| ArchPathol | Archives of Pathology |
| ArchSciMed | Archivio per le Scienze Mediche (Turin) |
| ArchToxicol | Archives of Toxicology |
| ArchToxikol | Archiv for Toxikologie (Berlin) |
| ARL | Association of Research Libraries |
| ARLIS | Art Libraries Society |
| ARLS | Appomattox Regional Library System |
| ARLS | Athens Regional Library System |
| ARM | Armada Free Public Library |
| ARO | Association Resources Online |
| ARRC | Academic Resource and Referral Center |
| ART | Advanced Reference Technology |
| ARTFL | American and French Research on the Treasury of the French Language |
| ARTL | Ada Run Time Library |
| arXiv | Archive (but see Additional Information) |
| ASCL | Astrophysics Source Code Library |
| ASCLA | Association for Specialized and Cooperative Library Agencies |
| ASCLA | Association of Specialized and Cooperative Library Agencies |
| ASCLA | Association of Specialized Cooperative Library Agencies |