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- ISBNs have contained thirteen digits, a format that is compatible with "Bookland" European Article Numbers, which have 13 digits. A separate ISBN is assigned...54 KB (6,204 words) - 12:31, 15 April 2023
- EAN-13 bar codes with a 977 "country code" (compare the 978 country code ("bookland") for ISBNs), followed by the 7 main digits of the ISSN (the check digit...20 KB (2,225 words) - 12:38, 15 April 2023