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POPSWorldCat xISBN (Web service) Readers everywhere use Amazon.com (or BarnesandNoble.com, or other book sites) to find books of interest and then wonder if the book is available at the local library. We love John Udell's LibraryLookup bookmarklet which makes this easy: when you have a book information page from an online bookseller displayed in your browser, you simply click on Jon's LibraryLookup bookmarklet to automatically check your library's OPAC for books with the same ISBN.