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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· 1961
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