How good is indoors RFID geolocation?
O(n) to catalog them if you start tagging them from one side of the room and don't intermix tagged and untagged pile of books.
IIRC while there are UHF RFID systems that can give rough physical locations, a clear line-of-sight between the reader and a UHF RFID tag is needed to get an adequate signal. If another book were on top of the book with a tag, that tag would probably not be detectable.
