National Museum of Nuclear Science & History
J. L. Hartman worked for the J.A. Jones Construction Company.
Heffner worked at the 200 East Area at Hanford during the Manhattan Project.
Gilbert Mathis was an electrical engineer at Los Alamos from 1943 to 1946. He was recruited for the Manhattan Project as a member of the US Army Signal Corps.
Sotero Romero was a staff worker at Los Alamos during the Manhattan Project.
