Found in a research paper entitled: ‘The diffusion routes of Jiu-Jitsu to and in the U.S. since the turn of the last century to 1930s:Focus on the transfiguration and succession of Jiu-Jitsu by the two Americans’ By YABU Kotaro (2012) (Ritsumeikan University, Japan) Yabu states that two Americans;, Risher W, Thornberry and John J. O’Brien […]
