I've had this book for over twenty-years, mainly because around that time I started training in koryu bujutsu, and more specifically Tenshin Shoden Katori Shinto Ryu. This book contains a fairly large section devoted to the classic martial arts, focusing entirely on Risuke Otake, headmaster of the TSKSR. Although the book doesn't go into particulars like Otake's own [b:The Deity And The Sword = Katori Shinto Ryu|9300240|The Deity And The Sword = Katori Shinto Ryu (#1)|Risuke Otake|http://d202m5krfqbpi5.cloudfront.net/books/1327563862s/9300240.jpg|14182916], the overview is interesting and illuminates why martial artists are attracted to classic martial arts that seem to have no practical value in modern times. The book also has sections on Kalaripayit, the Shaolin tradition, 'soft' martial arts of China, Karate, and modern martial arts, as well as a treatise on what the future might bring.
In short, a very interesting book for serious martial artists.