- Walter Henry Voskuil, Douglas F. Stevens, Gilbert Haven Cady, Alfred Hannam Bell, Bryan C. Parks, Earle F. Taylor, Gail Robert Yohe, George Elbert Ekblaw, George Vincent Cohee, Glen Charles Finger, Gordon W. Prescott, Harold Bowen Willman, James Marvin Weller, James Morton Schopf, James Norman Payne, John Everts Lamar, Louis Cordell McCabe, Morris Morgan Leighton, Ralph Early Grim, Ralph Kent Hursh, Robert Philip Sharp, W. F. Bradley, William Edwards Powers, G. N. Oliver, Adler Enzo Spotti, Carl A. Harman, Charles William Carter, G. W. Land, Harold Rollin Wanless, Myron H. Wilt, Frank Hynes Reed, Orin Wainwright Rees
· 1938
- Carl Buckner Rexroad, Charles Alexander Ross, George Elbert Ekblaw, Harold Bowen Willman, James Stewart Machin, John Paul Kempton, Lyle David McGinnis, Richard Henry Howard, Walter Edward Parham, William Arthur White, William Henking Smith, Willis L. Busch, John Everts Lamar, John Chapman Frye
· 1963
- Alfred Hannam Bell, John Everts Lamar, Walter Henry Voskuil, Daniel Jerome Fisher, Fay VaNisle Tooley, George Elbert Ekblaw, George Vincent Cohee, Gilbert Haven Cady, Glenn Charles Finger, Illinois State Geological Survey, James Morton Schopf, John Rice Ball, L. C. McCabe, L. D. McVicker, Lewis E. Workman, William Albert Newton, Frank H. Reed, G. N. Oliver, H. B. Willman, R. J. Piersol
· 1932
- John Webster Foster, Wayne Arthur Pryor, George Burke Maxey, George Elbert Ekblaw, Glenn Charles Finger, Harold B. Stonehouse, Harold Rollin Wanless, Harold Wesley Jackman, Howard R. Schwalb, James C. Bradbury, James Edward Hackett, James Stewart Machin, John Everts Lamar, Lester Leroy Whiting, Margaret B. Brophy, Meredith Eggers Ostrom, Morris Morgan Leighton, Orin Wainwright Rees, Robert Edward Bergstrom, Walter Henry Voskuil, Wolf von Engelhardt, Emile Desire Pierron, George Miller Wilson, Juanita Witters, Lidia F. Selkregg, Robert Louis Eissler, W. L. M. Tunn, Willis L. Busch, Frank Hynes Reed
· 1954