I've been considering purchasing a couple of books for my library for some time now, but they're both quite expensive. One is Shotokan Karate: A Precise History by Harry Cook. The other is Hidden Karate: The True Bunkai for the Heian Katas and Naihanchi by Gennosuke Higaki. Does anyone have or has anyone read either of these and if so, are they worth the exhorbitant prices they fetch? Thanks.