| Abbreviation | Definition |
|---|---|
| ISQ | Information Standards Quarterly |
| ISR | Information Skills Resource |
| ISRU | Information Search and Retrieval Unit |
| ISSL | Index to Sumerian Secondary Literature |
| ISSN | International Standard Serial Number |
| ISTC | Incunabula Short Title Catalogue |
| ISTC | International Standard Text Code |
| ITBL | Ira Township Branch Library |
| ITIL | Information Technical Infrastructure Library |
| ITL | Islamic Tools Library |
| ITL | Iterative Template Library |
| ITRL | I Tatti Renaissance Library |
| ITRL | Iowa Tax Research Library |
| IXT | IntraText Digital Library |
| JAAPA | J. of the American Academy of Physician Assistants |
| JAAPA | Journal of the American Academy of Physician Assistants |
| JABFM | Journal of the American Board of Family Medicine |
| JACC | Journal of the American College of Cardiology |
| JAgriFoodChem | Journal of Agriculture and Food Chemistry |
| JAirPollutControlAssoc | Journal of the Air Pollution Control Association |