The Doc Savage Method of Self-Defense (Doc Savage, April 1939)
From Author Wars - https://authorwars.com/books/the-doc-savage-method-of-self-defense-doc-savage-april-1939-3049518.html
From Author Wars - https://authorwars.com/books/the-doc-savage-method-of-self-defense-doc-savage-april-1939-3049518.html