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The publishing industry is in the process of switching all books from having 10 digit ISBN codes to 13 digit codes. While this transition is happening, both ISBNs will be printed on your books and on any order correspondence. You can use either ISBN until January 2007, when the ten digit ISBN will become obsolete.

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15y ago
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Abigail (Abby) Ward

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2y ago
wow, my book must be really old
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Jay P T

Lvl 1
1y ago
The same book/edition/translation/library softcover format: "Olav Audunsson II: Providence", an English translation published in 2021, has Bookland ISBNs 9781517911607 & 9781452966922 -- ????
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Jay P T

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1y ago

Unlike indie author/publishers, who must pay outlandishly for ISBNs, large publishers buy large blocks of ISBNs as a business expense. So the latter tack a new ISBN on anything as routine. It doesn't matter to the industry since both/either/any legitimately assigned/registered ISBN for a given book does the job.

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Q: Why do some books have 2 ISBN numbers?
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