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Arno Carl Fieldner, C. P. Bowie, Frank Stevens Crawford, Frederick William Lee, George Edward McElroy, Harry Fagan Yancey, J. S. Ross, James Washington Paul, Joel Howard Swartz, Ralph Homeward Espach, Reinhardt Thiessen, Simon Harry Ash, United States. Bureau of Mines, George Allison Irland, H. P. Rue, John Nicholas Geyer, O. C. Blade· 1914
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Arno Carl Fieldner, George Allison Irland, Gustav Wade, James Washington Paul, John M. Devine, United States. Bureau of Mines, William Bennett Berwald, Clarence John Wilhelm, Joseph Dana Davis, Leopold Nicholas Plein, Theodore W. Johnson, Ludwig Schmidt, Reinhardt Thiessen, Ernest Bowman Kester, Walter Alfred Selvig, Dewey A. Reynolds, F. W. Jung· 1934