- 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
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Chalmer Lewis Cooper, Frank Hynes Reed, Ralph Early Grim, Ralph Kent Hursh, Robert Mann Grogan, Walter Henry Voskuil, Willard Dickison Pye, William Frank Bradley, Douglas F. Stevens, Frederick Leicester Cuthbert, Harold Wesley Jackman, John Everts Lamar, Richards A. Rowland, Paul Wellana Henline· 1943
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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
No image available
No image available