If all books had an RFID in the spine listing the title of the book, the subject matter and the author and the books were stored randomly on shelves then a reader with a laser pointer could quickly sweep through the shelves and perhaps beep and flash a light when a typed in selection on the reader of any of the categories specified was pointed to. That would not only make storage and retrieval simple but also permit easy cross referencing as to subject and author and whatever other category was useful. .
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I think I see where you are going but I am not fully understanding the application. I am assuming use in a Barnes and Noble type facility. Because of the reader system books are stored randomly on the shelves in the store. The customer walks in, picks up a reader, types in what they want and the increasing beeps and flashes from the reader takes them to the appropriate book. What if I want more than one book or what if I am not sure of the title? Since the books are now stored randomly wouldn't I have to walk all over the store as the reader pointed me in the direction of its found set based on my criteria?
You have to be sure of something. Author, title, subject matter - any of these could be used to activate your reader. I don't imagine you walk into a store being literaly omnivorous. The reader would beep to your desires.