There are a few different possibilities:
- In order for holdings to display accurately in WorldCat.org, a library must have both a FirstSearch/WorldCat Discovery subscription and a Cataloging subscription with OCLC.
- Due to the format/edition grouping feature, an item's detail page will not necessarily show the edition on which your library has a holding. To show holdings for all editions of the same resource, toggle the link at the top right of the list that will read either "just this edition" or "any edition."
- If neither of these are true for your library or your library has questions, please contact OCLC Support.