- N. F. Le Jeune, Lee Clyde Ilsley, W. W. Adams, Arno Carl Fieldner, Carl A. Taylor, Earl Carlton Lane, F. W. Davis, G. H. West, George Edward McElroy, George William Jones, Harold Coulter George, J. E. Crenshaw, Jay John Jakosky, John H. Thompson, Ludwig Schmidt, Lynton Dewitt Wyant, Mayo Dyer Hersey, Oliver Bowles, Ozni Porter Hood, Percy Hoke Royster, Ralph Lyman Brown, Ray Thomas Stull, Richard Valentine Ageton, Rudolf H. Kudlich, Sidney Hershberg Katz, Allan Shakespeare Richardson, E. F. Pohlman, E. W. Butzler, Erskine Shearer Longfellow, George Addison Bole, H. M. Smith, Howard Bassett Freeman, John Jacob Bloomfield, R. L. Sebastian, Richard Duddleston Leitch, Thomas Leonard Joseph, William Henry Rinkenbach, William Parks Yant, H. G. Berger, Lawrence Bursley Berger, Selwyne Perez Kinney, W. A. Darrow
· 1923
- Martin Joseph Gavin, Richard Valentine Ageton, Willard Walker Cutler, Arno Carl Fieldner, Arthur L. Murray, Byron O. Pickard, C. Lorimer Colburn, C. R. Forbes, Charles Edward Munroe, Daniel Harrington, Donald B. Dow, Ernest Woodward Dean, Eugene Delos Gardner, F. J. Bailey, G. St. John Perrott, George Arthur Burrell, George Edward McElroy, Guy B. Taylor, H. F. O'Brien, J. J. Bourquin, John Gross, Joseph Dana Davis, Lee Clyde Ilsley, N. A. C. Smith, Oliver Bowles, R. M. Winslow, Raymond Bardeen Ladoo, Roy R. Hornor, Royd Ray Sayers, Royden Edward Head, Samuel Wilson Parr, Thomas Fraser, United States. Bureau of Mines, William Hawes Coghill, William Wallace Odell, A. D. Bauer, C. E. Coleman, Carl O. Anderson, George William Jones, H. H. Hill, Harry Fagan Yancey, Henry Rust O'Brien, Horace Chamberlain Porter, J. W. Paul, John T. Aydelotte, Lewis C. Karrick, Maurice Bacon Cooke, Palmer B. Place, Selwyne Perez Kinney, Sidney Hershberg Katz, Thomas Ernest Layng, Walker Stillwell Clute, C. R. Bopp, E. C. White, George Stanley Scott, W. B. Lerch, W. E. Perdew
· 1921