James R. McGuffey

William Yadasz

William Yadasz was a staff worker at Los Alamos during the Manhattan Project.

J. H. Siener

Minnie M. Daniels

Minnie M. Daniels was a laboratory technician and assistant in the Chemistry Division at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.

J. Arthur Widmer

Arthur Widmer worked for the Tennessee Eastman Corporation at the Y-12 Plant.