Actually, they have third party services that prepare the books. Publishers probably start with some kind of XML that they supply. There is some expense for the conversion houses, and they are supposed to be experts, but they probably don't proof or change content. I haven't really noticed enough to bother me (with the exception of the variety of font sizes). But then again, unless it's a technical document, I don't mind extremely imperfect OCR either, so I'm obviously not picky.
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