ISBN tester and formatter
If a publisher is marked Selbstverlag it is an author-publisher.
✔ Input: 978-386259906
✘ The checksum is missing
✔ ISBN-10: 3-86259-906-X
✘ No URL for testing provided
✔ ISBN-13: 978-3-86259-906-6
✘ No URL for testing provided
✔ Group: German speaking area
✔ Publisher: from Germany or Belgium

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