ISBN tester and formatter
If a publisher is marked Selbstverlag it is an author-publisher.
✔ Input: 0674993721
✔ ISBN-10: 0-674-99372-1
✔ Test, whether ISBN is used: 0-674-99372-1
✔ ISBN-13: 978-0-674-99372-3
✔ Test, whether ISBN is used: 978-0-674-99372-3
✔ Group: English speaking area
✔ Publisher: Harvard University Press

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Examples:http://swb.bsz-bw.de/DB=2.1/CMD?ACT=SRCHA&IKT=1007&TRM=MAGIC
http://www.ubka.uni-karlsruhe.de/kvk.html?SB=MAGIC&kataloge=SWB&kataloge=GBV

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