- Book Sale Finder - Guide to used book fairs and sales across the USA.
- Centre for the History of the Book - History, projects, and events.
- 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.
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