National Museum of Nuclear Science & History
Clarence Grover Sproul worked as a machinist on the Manhattan Project in Los Alamos, NM from January through June 1945.
W. R. Johnson worked for the Tennessee Eastman Corporation at the Y-12 Plant.
Madsen worked in the 100 D Area at Hanford during the Manhattan Project.
Robert van Gemert worked in procurement and supply for Los Alamos during the Manhattan Project. He was also involved in organizing preparations for the Trinity Test.
