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Creator
- Hobbs, Howard C.2
- Illinois State Geological Survey1
- Jirsa, Mark A.2
- Knaeble, Alan R.2
- Lively, R. S.1
- Lusardi, Barbara A.2
- Michigan Center for Geographic Information1
- Miller, James D., Jr.2
- Minnesota Geological Survey1
- Mossler, John H.4
- Ohio. Division of Geological Survey1
- Racine County Public Works and Development Services5
- Runkel, Anthony C.2
- Setterholm, Dale R.1
- Swithinbank, Williams, Ferrigno2
- Tipping, Robert G.2
- United States. National Park Service1