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ISBN - Wikipedia
International Standard Book Number | ISBN, Identification, …
How to Understand an ISBN Code - wikiHow
FAQs: General Questions | ISBN.org
About the ISBN standard | ISBN.org
What is an ISBN? | International ISBN Agency
What Is an ISBN and How to Get It? Your Definitive Guide to ISBN
ISBN and ISSN Systems: General Information and Resources
ISBN Definition & Meaning - Merriam-Webster
What Is An ISBN? | Book Riot