Valid ISBN ?

José Marcio Martins da Cruz at
Wed Aug 4 14:52:24 BST 2021


I've got a book with a ISBN number which seems to me invalid.

I tried to find if there was a recent change in ISBN naming rules, but found nothing.

Is someone can give me a clue ...

The number is 9798717287746

97987 doesn't seems to me a valid prefix.

Best regards


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