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My Identifiers is the only official website of the U.S. ISBN Agency. We provide you with the products and services to make your books more discoverable. Get your ISBNs today!

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Bowker | Connecting publishers, authors, and booksellers with readers

Bowker supports the needs of all publishers, big or small. Whether you’re a self-publishing author or general trade publisher maintaining a backlist of thousands, Bowker offers critical resources to satisfy your needs, including ISBNs, barcodes,


The most important identifier your book can have is the ISBN. As the U.S. ISBN Agency, Bowker is the ONLY official source of ISBNs in the United States. ISBNs provide unique identification for books and simplify the distribution of your books

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Bowker Identifier Services provides you with the resources you need to publish, distribute, and promote your books – and help readers find and purchase your titles. After you’ve written your book, you’ll need to buy an ISBN for each format of

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| Thorpe-Bowker | Identifier Services Skip to main content Google Tag Manager {{cartItemCount}} Sign In/Register Join VIP Mailing List Toggle navigation ISBNs, Barcodes, & SANs ISBN Buy ISBNs Why Buy An ISBN Buy ISBNs In Bulk ISBN Converter