National Museum of Nuclear Science & History
J. J. Donovan worked for the H. K. Ferguson Company.
C. M. Wallace worked for the J.A. Jones Construction Company.
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.
Attended Northwestern University.
Clarence Signaigo was a laboratory helper at the Metallurgical Laboratory in Chicago during the Manhattan Project.
