Most of my ePub books are also shorter than the paper versions. I suspect it's just as simple as words per page differences. ePub books have a set number of pages that are spread out over multiple page turns on any given device. On my nook and PRS-505 it's usually 2-3 page turns per ePub page, depending on the font size I'm using. This way, page #3 is the same across all devices, which I find preferable to the old method, which paginated differently for each device and/or font size. I suspect the ePub versions have more text per page than their paper counterparts, so we wind up with slightly "shorter" versions on our Readers than on our bookshelves, even though the number of words is identical.
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