H. M. Terpstra

George Hale

H. L. Russell

H. L. Russell worked for the United States Engineer District Office.

Martha G. Johnson

Martha G. Johnson was a laboratory technician in the Health Division of the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.

M. E. Johnson

M. E. Johnson worked for the Tennessee Eastman Corporation at the Y-12 Plant.