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checksum – ISBN has one or more incorrect digits; look for typos and transposition invalid character – ISBN has one or more 'digits' that is not in the allowed set appropriate to ISBN length invalid prefix – 13-digit ISBNs must begin with '978' or '979' invalid form – 10-digit ISBNs with the mis-positioned 'X' character
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.
The inclusion of text other than the digits of an ISBN in |isbn= corrupts the citation's COinS metadata and the citation's link to Special:BookSources. With a free-form reference, just append {{ISBN missing|date=December 2024}} to the end of the citation. With either method or format, it will render a [ISBN missing] inline note.
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 {}.
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For example | isbn = {{Listed Invalid ISBN|123-456-7890-123}} is incorrect use. Usage This template should only be used in limited cases when an editor knows that the International Standard Book Number (ISBN) printed in a source publication is invalid.
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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