A.T. Sprigg

Walter R. Julek

Walter R. Julek was a laboratory helper at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.

Richard Peterson

Maryella Weaver

Maryella Weaver was a staff worker at Los Alamos during the Manhattan Project.

John Costa

John Costa worked at the shop in the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.