National Museum of Nuclear Science & History
S. J. Helfman worked for the J.A. Jones Construction Company.
Majorie Feltz helped with clerical tasks at Los Alamos, including on the facility's supply records and cardex system in 1946.
Florentino Ortiz was a carpenter at Los Alamos during the Manhattan Project.
John Arthur "Jack" Robinson was a machinist and instrument maker at the Clinton Engineering Works in Oak Ridge, Tennesse in 1943.
