Kodokan Judo by Jigoro Kano, A to Z Of Judo by Syd Hoare, Best Judo by Isao Inokuma and Nobuyuki Sato, Ju No Kata: A Kodokan Judo Textbook by Keiko Fukuda, Winning Wrestling Moves by Mark Mysnyk, Wrestling for Beginners by Tom Jarman and Reid Hanley. They should keep you busy for a while.