National Museum of Nuclear Science & History
Graf worked at the 300 Area at Hanford during the Manhattan Project.
Cloyd Marvin had been drafted into the Army, interrupting his education at Haverford University, in 1943 and joined the Special Engineer Detachment as a technician third grade, later being assigned to Los Alamos National Labs in 1947.
J. E. Sampson worked for the United States Engineer District Office.
