The Complete Kano Jiu-Jitsu (Judo) by H. Irving Hancock and Katsukuma Higashi
The best guide to learning jiu-jitsu ever written in English, this is the most comprehensive study available. It describes the authentic form of judo developed in the late 19th century by Professor Jiguro Kano — not the many imitations often called by this name. Officially recognized by the Japanese government as the preeminent school of jiu-jitsu, the Kano system was the method in which Japanese armed forces and police were trained.
Softcover. Very good.