This book is the essential reference for any serious student of Judo. It was compiled from Kano's own writings and the contributors list is a star-studded cast of ninth and tenth degree black belts. It is especially valuable for anyone preparing for a black belt exam, since the method of performing the techniques shown is by definition correct. The book includes some excellent photography including photos of Kano himself performing some of the katas and 10th dan Kyuzo Mifune performing certain throws. If you only own one book about Judo, this should be it.