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Browse Illinois State Geological Survey (ISGS) by Contributor "Heckel, Philip H.,"

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Stratigraphy and biostratigraphy of the Mississippian subsystem (carboniferous system) in its type region, the Mississippi River Valley of Illinois, Missouri and Iowa

Brenckle, Paul L.; Lane, H. Richard (Champaign, Ill. : Illinois State Geological Survey,, 2005)

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