Very rare book on Daito Ryu Aikijujutsu. Don't be fooled by the title, this is a book on Aikijujutsu not Aikido. Tsuruyama was a student of Takuma Hisa who was a student of Sokaku Takeda. This is the first of 2 books in a series that Tsuruyama wrote. His other book is on the jo (staff).
1: Origin of Aiki Budo
2: Exploring the Source of Aiki Budo
222 page book