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International ISBN Agency

Includes a user's manual, prefix ranges, details of group agencies, publications, reports, and news.

ISBN Tools

Information and tools for using International Standard Book Numbers. Scan them with a CueCat, look them up, or search them.

ISBN.org

Enables applications to be made for ISBNs, SANs, and ISMNs in the United States and Puerto Rico, and provides information about the standards.