National Museum of Nuclear Science & History
Ernest Bray worked for the Roane-Anderson Company.
Heath worked in the United States Engineer District Office.
Stewart worked for Stone and Webster Engineering Corporation.
Cowan worked at the 100-B Area at Hanford during the Manhattan Project.
Hannibal Fraga was an engineer. He joined the Manhattan Project in the fall of 1944. He worked in the inspection department at Los Alamos.