The new Bookland EAN-13 checkdigit is computed in an unusual way with mod 10 and weight 3. This means the 13-digit ISBN numbers are always purely numeric. There is never an X checkdigit as there is sometimes with the mod-10, 10-digit ISBNs. 10-digit ISBNs and 12-digit UPCs are being unified as 13-digit EANs.
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