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.
When you are searching for a book in a library, you probably don't care which specific edition you get. We use the power of WorldCat, and OCLC Research's FRBR algorithm,
to locate other possible ISBNs for the book you're looking for.