- 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
- 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
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Chalmer Lewis Cooper, Cullen Warner Parmelee, Harold Bowen Willman, Heinz Adolf Lowenstam, John Everts Lamar, Leland Horberg, Morris Morgan Leighton, Orin Wainwright Rees, R. M. English, Ralph Early Grim, Stewart Huntley Folk, Cameron Gerald Harman, George Elbert Ekblaw, Robert Mann Grogan, Robert Ramon Reynolds, William Frederick Wagner, William Hubert Allaway, Frederick Leicester Cuthbert, Wilbur Glenn Tilbury· 1946
No image available
No image available
Ernest Paul Du Bois, Frank Emerson Tippie, Frank Hynes Reed, Harold Bowen Willman, Heinz Adolf Lowenstam, James Stewart Machin, Leland Horberg, Ralph Early Grim, Robert Mann Grogan, William Frank Bradley, William Heyden Easton, Carl Andrew Bays, Frederick Leicester Cuthbert, Harold Wesley Jackman, John Everts Lamar, Robert Ramon Reynolds, Paul Herbert, Paul Wellana Henline· 1945
No image available