If I import to Kobo, they're visible in the file system but in the Kobo folder. I haven't tried an external SD card yet. If I import to fbreader or Aldiko, it appears they're also visible in the file system. I would have to test this out specifically. I believe that fbreader and Aldiko use /books and /ebooks as subdirectories, respectively; Kobo uses KoboPegasus, and then a pile of bizarre subdirectories for the books.
I'll post a device debug.
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