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pr *
  • ISBN.org
  • 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.
4.2
(si*)
>20
7
  • Book Sale Finder
  • www.booksalefinder.com
  • Guide to used book fairs and sales across the USA.
4.1
(si*)
>60
4
  • International ISBN Agency
  • isbn-international.org
  • Includes a user's manual, prefix ranges, details of group agencies, publications, reports, and news.
4.0
(si*)
<5
8
  • ISBN Tools
  • isbntools.com
  • Information and tools for using International Standard Book Numbers. Scan them with a CueCat, look them up, or search them.
3.5
(si*)
<5
4
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