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Symptom
The title you searched for in worldcat.org is held by a number of libraries. You are wondering how you can find out the details of the specific copy held by one of the libraries.
Resolution
Scroll down to the "Find a Copy at a Library" section
Click on the "Borrow" button at the right hand side of the library who's copy you are interested in
You will be redirected to this library's own catalog which contains all the details of its specific copy and its lending conditions.