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Are You Ready for ISBN-13?
"On January 1, 2007, the book industry will begin using 13 digit ISBNs [International Standard Book Numbers] to identify all books in supply chain," rather than 10-digit numbers. The site explains why this change is being made, and provides a free online tool to convert an ISBN-10 to an ISBN-13. Also find related material for publishers and librarians.
http://www.isbn.org/standards/home/isbn/transition.asp

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