Search is a critical feature. Even in fiction it would come in handy. When I read a 19th century novel, there are details about characters that become relevant a couple of hundred pages later. Being able to instantly find all the places where that character is mentioned would let me get more out of the book faster. I really like the idea of being able to save 20 or so searches per book. This would be a big benefit to college students and would help them write papers.
For nonfiction books, especially in the humanities and social sciences it would be of even greater utility.
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