The ISBN was originally developed as a 10-digit number, which for more than three decades has performed extremely well as a catalog number for books. However, the International ISBN Agency has determined that sometime in the not-too-distant future they will begin to run out of 10-digit numbers for publishers. Accordingly, in January 2007, the ISBN will be redefined from a 10-digit to a 13-digit number. ManaSystems are able to offer a number of conversion tools and API's to ease the transition by converting existing ISBNs to ISBN-13.
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