The books for which there are duplicates all appear to be books that I emailed to the device from Calibre. Oddly, on at least some (I haven't check them all), the indicator for the amount of the book that has been read is different. Also, the duplicate books all appear to have been copied from the now-dead PW and not downloaded via sync. So somehow, the old PW wound up with duplicates of some books. Sadly, I can't experiment with the old PW to see if I can learn anything interesting because it is dead, dead, dead. Did I mention that the old PW is dead?
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