Alfred Hannam Bell / Chalmer Lewis Cooper / Frank Hynes Reed / Frederick Squires / Harold Bowen Willman / Illinois State Geological Survey / James Morton Schopf / Ralph Early Grim / Ralph Kent Hursh / Willard Dickison Pye / William Heyden Easton / John Everts Lamar / Leonard Richard Wilson / Richards A. Rowland / Ray Bentall |