~/Music/iTunes/iTunes Music/Automatically Add to iTunes
If iTunes is currently running, the ebook will import immediately, otherwise it will import next time you run iTunes. (This folder also works for music and movies.)
Unfortunately there's still no way to add the ebook to the iBooks app on your iPad without syncing to iTunes.
Related Posts:
How To Read O’Reilly eBooks on the iPad
How to read O'Reilly ebooks on the iPad that aren't from the iBooks store




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