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I suppose the case could be argued that every format needs a unique identifier, but there's NO WAY I'm going to pay for an identifier for every format of every ebook I produce, so that's the end of it for me. That would mean 8 ISBNs for each title because it has 7 ebook formats + a print one. I own a few ISBNs that I have not used yet, and I am reserving them for future print products.
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