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ISBN - Wikipedia
ISBN US - R. R. Bowker
Welcome to the U.S. ISBN Agency! | ISBN.org
About the ISBN standard | ISBN.org
What Is an ISBN and How to Get It? Your Definitive Guide to ISBN
What is an ISBN? | International ISBN Agency
How to Get an ISBN Number for Your Book - Reedsy
International Standard Book Number | ISBN, Identification, …
ISBN and ISSN Systems: General Information and Resources