Re: i need help finding a book
another interesting read which can provide some spiritual/historical background to the eventual zen influence on the japanese martial arts is
"The Bodhisattva Warriors: The Origin, Inner Philosophy, History and Symbolism of the Buddhist Martial Art Within India and China"
it mainly focuses on the the buddhist influence on the warrior classes of india it's spread to the chinese chaun fa (spelling?) or kung fu, which obviously influenced and cross cultured with the jujutsu of japan. Basically I see it as getting a deeper understanding of the asian culture of which Ueshiba was heir to and possible influences on aikido.