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Helpful answers
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Mar 25, 2015 6:40 AM in response to kenfromUKby mauscal,did you get any answer for your question? did you publish without the ISBN?
thanks,
maurizio
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Mar 25, 2015 7:40 AM in response to mauscalby julianporter5,No its not required.
https://www.apple.com/uk/itunes/working-itunes/sell-content/books/book-faq.html