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That publisher, Berrett-Koehler, only supplies their ebooks in PDF and ePub format.
Our ebooks team is checking to see if we can get a mobi format, but they doubt we'll get one.
If you need a mobi format for that, you can download Calibre ( http://calibre-ebook.com/ ) and
that program will convert the ePub to a mobi format.
O'Reilly Customer Service