Allen Francis Agnew / Carl Andrew Bays / Frederick Squires / Glenn Charles Finger / Harold Bowen Willman / Illinois State Geological Survey / James Marvin Weller / James Norman Payne / John Everts Lamar / Joseph F. Booton / Leland Horberg / Morris Morgan Leighton / Walter Henry Voskuil / Douglas Franklin Stevens / Alfred Hannam Bell / Don Carroll / Frank Hynes Reed / Gilbert Haven Cady / Kenneth Orris Emery / Mathew L. Kalinowski / Stewart Huntley Folk | 