G. W. Houtrouw

Blanche J. Lawrence

Blanche J. Lawrence was an African-American research assistant in the Health Division of the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.

F. E. Hill

A. H. Caldwell

A. H. Caldwell worked for the G.G. Ray Company.

Arkie Regnault

Arkie Regnault worked for the Roane-Anderson Company.