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Just a quick one. I was wondering whether it's the done thing to stick all variants of ISBN for the same book in the copyright page of all file types, or whether you should only put the ISBN/ASIN for the current version (so the EPUB file will just have the EPUB ISBN, or it will list all the numbers like the paperback ISBN as well).
Hope that makes sense. Cheers!
Hope that makes sense. Cheers!