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These books all have a valid isbn-number: A [non-existing] book with an illegal isbn number Java in a nutshell The C programming language Politikens håndbog i nudansk Handbook of formal languages, vol. 1 The LaTeX companion JavaScript, the definitive guide CGI programming on the world wide web ... and so have a lot of other books ...
Try with some of your own books: ISBN number: ISBN number: ISBN number:
