Suppose you're shopping on Amazon for a book like Lawrence Lessig's '''Free Culture: How Big Media Uses Technology and the Law to Lock Down Culture and Control Creativity''', and you wonder if your local library has a copy of the book. Amazon displays the ISBN near the title or product details. The catalog for the [http://www.mvlc.org/Libraries Merrimack Valley Library Consortium ] supports lookup by ISBN. If you perform the search, you'll notice that the resulting URL for that search is
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http://newburyport.mvlc.org/eg/opac/record/888792?contains=contains;_special=1;qtype=identifier%7Cisbn;query=978-1594200069;locg=1
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