Books that help improve your chess without a chessboard? I am looking for books that can help me improve without a physical/digital chessboard. I have a kindle, and I have many places in school where I can read, but not many where I can open a chessboard without people coming from all 4 corners to see what I am doing.

EDIT:

To help for further reference, I am 1750 in Correspondence chess in chess.com
One book that can mostly be read without a chess board is Willy Hendriks' "Move First Think Later", one of my favourite chess books. It mostly contains puzzles and some interesting musings from the author.

Also, even though you are not looking for a digital solution, I have to add that I find DroidFish (available on Android) to be a nice compact way to read chess books on my daily commute while still having the power of a GM level analyst right there.