Thread: ISBN13 support
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Old 11-08-2010, 03:31 AM   #2
theducks
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Are those first 3 numbers 978 or 979? (those are the EAN number ranges reserved for books).

A Red condition indicates a Check Digit (the 13th last digit) calculation mismatch.
Numbers Only (no I, l or O allowed )

Publishers have been known to make printing/calculation (bar code) errors.
While I have not seen it done on books, I have seen "made up" EAN numbers on food goods imported to the USA..
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