R. P. Mack

Fred Lederer

Fred Lederer worked for the Roane-Anderson Company.

Joseph H. Heartberg

Joseph H. Heartberg was a security guard at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.

R. M. Saunders

R. M. Saunders worked for the United States Engineer District Office.

Earl R. Easly