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. 
6 1/2" x 8 1/2" hand signed writings which start out, The Anceint Writers of Buddhism and hand signed, Herbert Wm. Mullin. On the back Mullin has written, "The Heart of Understanding" and hand signed the bottom, HW Mullin.

Herbert Mullin Ancient Writers of Buddhism Signed