Franklin V. Summers

M. E. Ridge

M. E. Ridge worked for the United States Engineer District Office.

R. L. Jarvis

Jack D. East

Jack D. East worked in the Instrument and Physical Measurements Group in Clinton Laboratories at the X-10 Reactor.

Frank R. Johnson

Frank R. Johnson was a research assistant at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.