Herbert William Mullin was an American serial killer born on April 18, 1947 who operated in Santa Cruz, CA. 
Mullin was serving life in prison for 13 murders which he says he committed to prevent further natural disasters.  Mullin died of natural causes on August 18, 2022.

Approximately 6" x 9" Dr. Albert Einstein's principles of relativity on one side.
On the other side is a writing titled, "4 great blue herons". 
Each side is hand signed, H.W. Mullin.