Shinja 2013

https://ashidakim.com/ShinjaHoH2013.html

fifty percent ground grappling. The art is recognized by the United States Ju-Jitsu Kai and many more. The philosophy of an art gives direction to that art, Bushi Ryu Ju-Jitsu is

Dave Liepmann

https://www.daveliepmann.com/articles/library.html

and Vital Judo II: Grappling Techniques by Okano are both incredible gems. Judo Training Methods by Ishikawa & Draeger. Judo in Action: Grappling Techniques by 9th dan Kudo. Aikid

That's everything I could find.
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