Bookland ISBN/ISSN

This is a Bookland ISBN code, which means it's an ISBN number encoded as an EAN/UCC-13. You can tell this by the first three digits of the EAN/UCC-13 (978). The numbers after that are the ISBN. You'll notice the last digits differ, though -- EAN/UCC-13 and ISBN calculate their check digits differently (in fact, the check 'digit' on an ISBN can be a digit or the letter X).

EAN/UCC-13 9780399526671
ISBN 0-399-52667-6

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