- Richard Henry Howard, Alfred Hannam Bell, David L. Reinertsen, David Lloyd Stevenson, Harold Jay Gluskoter, Harold Wesley Jackman, James C. Bradbury, John Albert Harrison, John Chapman Frye, Kenneth Edward Clegg, Lyle David McGinnis, Merlyn Boyd Buhle, Orin Wainwright Rees, Paul C. Heigold, Richard Charles Anderson, Richard David Harvey, Robert William Orr, William Arthur White, William Hilton Johnson, Willis L. Busch, John E. Brueckmann
· 1964
- Chalmer Lewis Cooper, Cullen Warner Parmelee, Frank Emerson Tippie, Harold Bowen Willman, Heinz Adolf Lowenstam, Leland Horberg, Ralph Early Grim, Roy John Helfinstine, Stewart Huntley Folk, Walter Henry Voskuil, Cameron Gerald Harman, Charles C. Boley, Douglas F. Stevens, Frederick Leicester Cuthbert, Nina T. Hamrick, Robert Ramon Reynolds, William Hubert Allaway, Paul Herbert
· 1945
- Alan Martin Jacobs, D. L. Stevenson (David Lloyd), Gordon S. Fraser, Harold Wesley Jackman, Illinois State Geological Survey, James Watson Baxter, Norman C. Hester, Paul C. Heigold, R. N. Leamnson, Russel Allen Peppers, Willis L. Busch, Alan T. James, H. H. Damberger, Josephus Thomas, Richard Charles Anderson, Roy John Helfinstine, Henry Phillip Ehrlinger
· 1969
- Chalmer Lewis Cooper, Cullen Warner Parmelee, Ernest Paul Du Bois, Frank Emerson Tippie, Frank Hynes Reed, Harold Bowen Willman, Heinz Adolf Lowenstam, Illinois State Geological Survey, James Stewart Machin, Leland Horberg, Ralph Early Grim, Robert Mann Grogan, Roy John Helfinstine, Stewart Huntley Folk, Walter Henry Voskuil, William Frank Bradley, William Heyden Easton, Cameron Gerald Harman, Carl Andrew Bays, Douglas F. Stevens, Frederick Leicester Cuthbert, Harold Wesley Jackman, John Everts Lamar, Robert Ramon Reynolds, Nina T. Hamrick, Paul Herbert, Paul Wellana Henline
· 1942