One number is 10 digits long, the other is 13. They are both for the same edition of the same book. About a year ago, the publisher association started requiring new books to use the 13 digit version, but actually most new books have both.
Hope this helps, Misha Robert Tweedy wrote:
The book I am doing now has two different ISBN mumbers which you would think hard cover and paper back take a look at this.Paperback Editions April 2008 : Mass Market PaperbackCover of ISBN: 0373772947 <http://www.fantasticfiction.co.uk/edition/?isbn=0373772947> Title: Draycott Eternal: What Dreams May Come\Season of WishesAuthor(s): Christina Skye ISBN: *0-373-77294-7* / *978-0-373-77294-0* (UK edition) Publisher: Harlequin Booksmsn rftweedy@xxxxxxxx <mailto:rftweedy@xxxxxxxx> phone number 316.5245454 skype bobwichitaks
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