Clarence Watson Owings / Joe Perry Morris / John W. Moore / R. Ward Stahl / Richard N. Appling (Jr.) / United States. Bureau of Mines / W. A. Calhoun / W. A. Cole / C. H. Dodge / H. N. Dunning / John P. Harmon / V. C. Petersen / W. A. Grosh / C. J. Stehlik | 