National Museum of Nuclear Science & History
J. J. De Groot worked for the J.A. Jones Construction Company.
In the 1944 Hanford Phone Book, he is listed under R. C. Theil. In the 1945 Hanford Phone Book, he is listed under R.
N. A. Powell worked for the Kellex Corporation at the K-25 Plant.
Attended the University of Michigan.
