ISBN tester and formatter
If a publisher is marked Selbstverlag it is an author-publisher.
✔ Input: 1579223664
✔ ISBN-10: 1-57922-366-4
✔ Test, whether ISBN is used: 1-57922-366-4
✔ ISBN-13: 978-1-57922-366-3
✔ Test, whether ISBN is used: 978-1-57922-366-3
✔ Group: English speaking area
✔ Publisher: from the USA or Puerto Rico

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