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ISBN barcode sample

An ISBN-13 barcode is an EAN-13 barcode whose number starts with 978 or 979. Publishers print it on the back cover of every book.

The last digit is a check digit. If it is wrong, it is replaced with the correct one, so the barcode always scans. Remove hyphens from the ISBN first (978-0-306-40615-7 becomes 9780306406157).

Digits only: 13 digits starting with 978 or 979 (or 12 digits and the check digit is added). Without hyphens.