If the books aren't on a microSD card (that you plugged into the tiny slot on the lower-left side of the device), meaning they're stored on the device themselves, you just go to the main screen, select Library, then Books, then page through the list to find the one you want. Click on the icon that looks like 4 or 5 horizontal lines and choose the delete option from the menu that pops up. (if you have the LARGE icons showing, you might have to press and hold on the picture in order to bring up the menu)
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