The reading list plugin can make a list of books on the device when you connect it. It keeps a different list for each device.
Theducks method is better if you will want to look for books on any device or on more than one device. Personally I would use a like-tags custom column instead of a general tag, and I would first remove the book tag from all books before the select & add steps to be sure there aren't any leftovers.
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