A. W. Deurbrouck / Albert E. Schreck / C. E. Hennig / Eugene T. Sheridan / Harvard Eng / Howard W. Wainwright / Ignaz Lichtig / Joseph A. DeCarlo / Lawrence G. Marshall / Lotfollah Nahai / Mary S. Esfandiary / Nils A. Eilertsen / Phillip Maxwell Busch / Richard S. Watt / United States. Bureau of Mines. Office of Chief Economist / Heine Kenworthy / Maxine M. Otero / Virginia C. Berté |