- 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
- A. R. Elliott, Alan Leighton, Alfred R. Powell, Arno Carl Fieldner, Arthur L. Murray, Arthur Warren Ambrose, Earl W. Wagy, F. J. Bailey, Frederick B. Tough, George Samuel Rice, George St. John Perrott, Harry Harkness Stoek, James R. Jones, John H. Wiggins, Joseph Wesley Thompson, Lee Clyde Ilsley, Oliver Bowles, Raymond Bardeen Ladoo, Robert J. Anderson, Roy Edward Collom, Roy O. Neal, Thomas Thornton Read, Thomas Varley, Vannoy Hartrog Manning, Walter A. Selvig, William Clifton Phalen, William Waugh Adams, A. B. Hooker, Ernest J. Gleim, John Edward Crawshaw, Fred D. Osgood
· 1920
- Lee Clyde Ilsley, Arno Carl Fieldner, Byron O. Pickard, Carl Alton Allen, Charles Edward Munroe, Charles Wesley Davis, Daniel Harrington, Donald B. Dow, Dorsey A. Lyon, Dorsey J. Parker, Ernest Woodward Dean, Eugene Delos Gardner, Frederick Bevan Tough, George Samuel Rice, H. F. Bain, Hubert W. Davis, J. J. Bourquin, John Allen Davis, John Blizard, John Gross, John H. Wiggins, Joseph Wesley Thompson, L. H. Sharp, Lewis C. Karrick, Louis Downer Tracy, N. A. C. Smith, Oliver Bowles, Raymond B. Ladoo, Robert John Anderson, Roy R. Hornor, Sidney Hershberg Katz, Thomas Thornton Read, Thomas Varley, Winslow Hobart Herschel, A. A. Straub, A. B. Hooker, A. T. Strunk, Arthur L. Murray, B. W. Dyer, C. C. Stevenson, James Neil, Lewis Evens Jackson, Maurice Bacon Cooke, R. A. Kearns, Spencer Pritchard Howell, William Hawes Coghill, A. D. Bauer, George William Jones
· 1921