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Creator
- Machamer, J.F.3
- Wisconsin Department of Natural Resources2
- Ault, Curtis H.1
- Chen, Wei1
- Dan Milz1
- Griffin, W. L. (Geologist)1
- Guernsey, E. Y.1
- Heisterkamp, A. J.1
- Ikola, R.J.1
- Len Kne1
- Levinson, David M.1
- Moran, W. H. (William H.)1
- Morey, G.B.1
- Ohio. Division of Geological Survey1
- Ojakangas, Richard W.1
- Paul Jacobs1
- Powell, Richard L.1
- Prout, Joseph E., cartographer.1
- Rebecca Barney1
- Sims, Paul K.1