Herbert William Mullin early 1970's Santa Cruz, California serial killer serving life in prison for 13 murders he committed which he said were carried out to prevent earthquakes and further natural disasters. 

8 1/2" x 11" Barely Thinking two-sided writings. Hand signed on the front, Herbert William Mullin.
Hand signed again on the back, H.W. Mullin.

Herbert Mullin Barely Thinking Signed Twice