Clement J. O’Hara

Robert M. Hargraves

Robert Hargraves worked for the H. K. Ferguson Company.

J. L. Clark

R. V. Weisenfluh

R. V. Weisenfluh worked for the Union Carbide & Carbon Corporation.

Ruth Hoffberg

Ruth Hoffberg was a stenographer at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.