National Museum of Nuclear Science & History
Roy Schroeder was a laboratory assistant at the Metallurgical Laboratory in Chicago during the Manhattan Project.
Hartman worked for Stone and Webster Engineering Corporation.
R. L. Earle worked for the Tennessee Eastman Corporation at the Y-12 Plant.
Sadelle T. Greenblatt was a research assistant in the Instruments Division of the University of Chicago’s Metallurgical Laboratory during the Manhattan Project.