Konrad T. Semrau

Helena Calloway

Helena Calloway was a laboratory assistant in the Chemistry Division of the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.

Ruth M. Jackson

E. Prendergast

E. Prendergast worked for the United States Engineer District Office.

H. L. Roland

H. L. Roland worked for the Midwest Piping and Supply Company.