National Museum of Nuclear Science & History
R. Niekirk worked for the Roane-Anderson Company.
Bickley worked in the United States Engineer District Office.
A. H. Caldwell worked for the G.G. Ray Company.
Daniel J. Keefe was a security guard at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.
Bloch worked in the United States Engineer District Office.
