- E. Joyce Kennedy, George Muggah Hughes, Hubert E. Risser, Jerry Alvin Lineback, John Chapman Frye, Neil F Shimp, Paul B. DuMontelle, R. R. Ruch, Richard David Harvey, Thomas Charles Buschbach, David L. Gross, Harold Jay Gluskoter, John C. Steinmetz, R. N. Farvolden, Robert E. Cole, Norman C. Hester, Robert P. Meyer, Ronald Arthur Landon
· 1971
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No image available
Alan Martin Jacobs, Arthur Byron Leonard, Donald Clifford Bond, Gordon S. Fraser, Harold Bowen Willman, Hermann W. Pfefferkorn, Hubert M. Bristol, Illinois State Geological Survey, Ronald Arthur Landon, Theodore C. Labotka, William Hilton Johnson, Willis L. Busch, John C. Steinmetz, John Chapman Frye, John Paul Kempton, Richard David Harvey, Richard Henry Howard, Russel Allen Peppers, Paul C. Heigold, Tom Lee Phillips· 1971
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No image available
No image available
No image available