1990. 2016-06-07T13:47:27Z. 2016-08-20T21:02:56Z. Nelson, W. John. Illinois Department of Energy and Natural Resources, Illinois State Geological Survey. English. cartographic image. Public. Illinois, Johnson County, Pope County, Saline County, Johnson County (Ill.), Pope County (Ill.), Saline County (Ill.), Stonefort Region, U.S., Johnson County., Pope County., and Saline County.
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