I haven't tried any O'Reilly books, but in some of the books I have in ePub format the graphics are very small and unreadable. The Kobo has no means, at least that I've been able to find, to enlarge graphics. Unlike the Kindle, for example, where you can select the graphic and enlarge it. O'Rielly books may very well have the graphics pre-formatted in a readable size.
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