- N. F. Le Jeune, A. D. Bauer, Byron Oscar Pickard, John Robert Reeves, Theodore Earl Swigart, Arno Carl Fieldner, C. E. Sims, C. L. Colburn, Charles Edward Munroe, Clyde Elmer Williams, Craig Miller Bouton, Daniel Harrington, Edward H. Denny, Ernest J. Gleim, Eugene Delos Gardner, George Samuel Rice, George William Jones, Henry Alfred Doerner, Henry Kreisinger, Hilary Breton Brunot, J. J. Jakowsky, John Allen Davis, Joseph Dana Davis, Lee Clyde Ilsley, Leonard Greenburg, Ludwig Schmidt, Nicholas Arthur Clarke Smith, Oliver Bowles, Raymond Bardeen Ladoo, Robert John Anderson, Ronald Van Auken Mills, Royd Ray Sayers, Rudolf H. Kudlich, Sidney Hershberg Katz, Spencer Pritchard Howell, Thomas Varley, William Albert Dunkley, William Marsh Myers, William Melvin Weigel, William W. Odell, William Waugh Adams, H. B. Freeman (Jr.), Alva Britt Hooker, George Wetherall Smith, Harry Mac Cooper, J. E. Crawshaw, James Washington Paul, John Blizard, L. G. Marsh, Maurice Bacon Cooke, Max Wilhelm von Bernewitz, Paul Hopkins, William Parks Yant, Fred Davidson Osgood, Lawrence Bursley Berger
· 1922
- William Waugh Adams, Byron Matthew Bird, Albert John Kraemer, Arno Carl Fieldner, B. Marvel O'Harra, Byron Oscar Pickard, Carl A. Taylor, Clyde Elmer Williams, Daniel Harrington, Earl Renwick McMillan, Edmund Spriggs Leaver, F. C. Gregory, F. C. Houghten, George William Jones, Harold Carl Miller, Horace Wadsworth Gillett, J. E. Crawshaw, J. J. Jakosky, Lee Clyde Ilsley, Martin J. Gavin, Mayo Dyer Hersey, N. F. Le Jeune, Nicholas Arthur Clarke Smith, O. P. Hood, Oliver Bowles, Ronald Van Auken Mills, Royd Ray Sayers, S. H. Brooks, Spencer Pritchard Howell, Thomas Thornton Read, United States. Bureau of Mines, W. W. Odell, William John McConnell, William Marsh Myers, Charles Edward Munroe, Constantin Promos Yagloglou, D. D. Stark, E. W. Butzler, Edward Lawrence Mack, Edward Phillip Barrett, H. B. Brunot, H. E. Messmore, H. M. Smith, I. H. Nelson, Lewis C. Karrick, Max Wilhelm Von Bernewitz, R. V. Thurston, Sidney Hershberg Katz, Thomas Leonard Joseph, William Parks Yant, Bernard Marvin Larsen, Dewey A. Reynolds, E. P. Buxton, L. P. Calkins, Percy Hoke Royster
· 1923