Book Sale Finder - http://www.booksalefinder.com/ Guide to used book fairs and sales across the USA.
ISBN.org - http://www.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.
ISBN Tools - http://isbntools.com/ Information and tools for using International Standard Book Numbers. Scan them with a CueCat, look them up, or search them.
International ISBN Agency - http://isbn-international.org/ Includes a user's manual, prefix ranges, details of group agencies, publications, reports, and news.
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