Effective January 1, 2007, the length of the International Standard Book Number (ISBN) officially changed from 10 to 13 digits. This change requires book industry organizations to use 13-digit ISBNs instead of 10-digit ISBNs when identifying books. However, some booksellers are still using the older, 10-digit format. If I have both numbers, I will give you both so that you may use whichever one applies to your bookseller. If there are two, both numbers refer to the same book.
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Last updated: 2014-10-07 6:49