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Currently, a publisher must have a seperate isbn numer for the eBook version of a book, NOT one for each ebook format, although for some reason, some distributors seem to want it that way.
I think one isbn for all ebook formats is adequate at present, but as we begin moving towards appreciating and providing the content of a book rather than the context in as many ways as the consumer wants, we will have to look at a different system with perhaps a parent digital isbn with multiple identifiers applicable in the last 2 digits.
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