Quote:
Originally Posted by Fiat_Lux
When neither vendor nor customer will use an ISBN, why provide an ISBN for the specific format?
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Because an ISBN is supposed to uniquely identify a specific format of a book, whether that be paperback, hardback, ePub, PDF, Kindle or anything else. As I said in a previous post, though, there are no "ISBN police", so how they use ISBNs is a decision for each individual publisher to make.