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The ISBN may have been incorrectly labelled invalid, but we have (to our surprise) found several examples where the publisher has put an invalid number on the book (see talk page for examples). Note that just because a number has not been identified as invalid, it doesn't mean it corresponds to the book in question, or indeed any book.
Entries with invalid ISBNs that are nonetheless printed in a book can be tagged with {{Listed Invalid ISBN}}. Also, if particular ISBNs in a list of ISBNs are known to be invalid, this can be indicated by providing corresponding invalid1=yes to invalid9=yes parameters in the {} or {} templates.
Some ISBNs may still have been printed correctly elsewhere in the same book or corrected in later editions; if further research shows that to be the case (and that the new ISBN still refers to an edition with the same information on the same pages), then the invalid# parameter should be moved or {{Listed Invalid ISBN}} should be replaced with {}.
OTOH, contributors with an ISBN from the book in their hand may feel obligated to add the ISBN to the article. Perhaps we could create a template {{Invalid ISBN|2-204-19850-9}} that results in <!-- Invalid ISBN: 2-204-19850-9 -->. Would that cause google searchs for the invalid ISBN to bring up the article?
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If the ISBN is failing to validate, it is likely that there is a typo in the main part of the number. In this case, recalculating the check digit results in an apparently valid ISBN that leads to the wrong source (or to nowhere). If you only have a 10-digit ISBN, do use the number as-is, do not try to convert it to the 13-digit form. If the ...
The International Standard Book Number (ISBN) is a numeric commercial book identifier that is intended to be unique. [a] [b] Publishers purchase or receive ISBNs from an affiliate of the International ISBN Agency. [2] A different ISBN is assigned to each separate edition and variation of a publication, but not to a simple reprinting of an ...