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 | 