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The ISBN on my pbook is 071266131X
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Modern ISBNs are purely digits and last one is a check digit. Also that's an old 10 digit code.
Usually the first three digits of an ISBN are now 978 = Bookland so it's compatible with UPC/EAN because ISBNs are for ordering a particular edition. The same title may have many ISBNs as each size or publisher of paperback of same content should be a different ISBN. Also a revision is supposed to have a different ISBN.