National Museum of Nuclear Science & History
Stanley Bloom worked for the Roane-Anderson Company.
Robert Hargraves worked for the H. K. Ferguson Company.
Charles W. Hagen was a research assistant at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.
John Mihalkanin was a laboratory helper at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.
