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ISBN US - R. R. Bowker
Welcome to the U.S. ISBN Agency! | ISBN.org
About the ISBN standard | ISBN.org
International Standard Book Number | ISBN, Identification, …
What is an ISBN? | International ISBN Agency
What Is an ISBN and How to Get It? Your Definitive Guide to ISBN
FAQs: General Questions | ISBN.org
ISBN, ISSN, DOI: what they are and how to find them - Wiley