I've been messing around with the Android NOOK app a lot lately and you can get to the books using that. The default location ("/data/data/bn.ereader/files/B&N Downloads/Books") requires root access. If you tell NOOK to store the books on the SD Card (Settings->Download & Storage), then they can be retrieved without root from (usually) "{CARD}/Android/data/bn.ereader/files/Download" where the card path will likely be "/storage/sdcard1" or similar.
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