National Museum of Nuclear Science & History
Gebhart worked in the 200 East Area at Hanford during the Manhattan Project.
R. Y. Blackwell worked for the Fercleve Corporation.
Joe W. Howland was a medical officer in charge of special problems in the US Army, stationed in Oak Ridge, Tennessee and Rochester, New York during the Manhattan Project.
Jas Hopkins worked for the United States Engineer District Office.
Helen Williams was a stenographer and clerk at the University of Chicago’s Metallurgical Lab (“Met Lab”) during the Manhattan Project.