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Creator
- George List53
- Sponsor: Mrs. Shirley Quate5
- Editor: Don Kennerly4
- Geological Survey (U.S.)4
- Sponsor: Robert L. Campbell4
- Editor: Thomas Kennedy3
- Illinois State Geological Survey3
- Photographer: Dorwin, John T.3
- United States. Army Map Service3
- Editor: Dennis Hoffman2
- Editor: Judy Hughes2
- Sponsor: Prof. Shirley Quate2
- Bloomington Chamber of Commerce (Bloomington, Ind.)1
- Cisneros, José1
- Editor: David Wright1
- Editor: Thomas L. May1
- Guide Art Co.1
- H.M. Gousha Company1
- Kingsbury, Robert C.1
- Sponsor: Robert S. Campbell1