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This seems to be a TOPAZ ebook. Most TOPAZ ebooks are badly formatted, but there are exceptions. TOPAZ ebooks can have embedded fonts and are perhaps closer to ePub in capability that MOBI (it is difficult to be sure, because only Amazon knows what is in a TOPAZ ebook).
O'Reilly was offered the option of producing TOPAZ versions for the Kindle, but decided to stick with AZW (MOBI) although the result can't be as good as their ePub version.
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