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<p>That should not be true … the ISBN number should be a unique identifier for only one book.</p>
<p>From [Frequently</a> Asked Questions About the ISBN](<a href=“http://www.isbn.org/standards/home/isbn/us/isbnqa.asp]Frequently”>FAQs: General Questions | ISBN.org)
“The purpose of the ISBN is to establish and identify one title or edition of a title from one specific publisher and is unique to that edition, allowing for more efficient marketing of products by booksellers, libraries, universities, wholesalers and distributors.”</p>