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Creator
- Collett, John, 1828-189914
- Cox, E. T. (Edward Travers), 1821-190712
- Indiana. Geological Survey11
- Levette, G. M. (Gilbert M.)9
- Gray, Henry Hamilton, 1922-5
- Hutchison, Harold C. (Harold Christy), 1925-5
- Wayne, William J. (William John), 1922-5
- Borden, W. W. (William Wesley), 1823-19064
- Illinois State Geological Survey4
- Keller, Stanley J.4
- Wier, Charles E. (Charles Eugene), 1921-4
- Patton, John B. (John Barratt), 1915-3
- Powell, Richard L.3
- Forsyth, Jane L. (Jane Louise), 1921-2
- Johnson, Gerald H.2
- Macpherson, J. C. (John C.)2
- Moran, W. H. (William H.)2
- Morrison, Samuel (Civil engineer)2
- Murray, Haydn H. (Haydn Herbert), 1924-2
- Schneider, Allan F. (Allan Frank), 1926-2