Spores in strata of late Pennsylvanian cyclothems in the Illinois Basin (Illinois. State Geological Survey. Bulletin)
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Rhythms in upper Pennsylvanian cyclothems: Thickness of glacial drift in DuPage county, Illinois / by A.C. Mason (Circular / Illinois State Geological Survey)
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A Concise Geologic Time Scale: 2016
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ORIGIN OF PHOSPHATIC BLACK SHALE FACIES IN PENNSYLVANIAN CYCLOTHEMS OF MID-CONTINENT NORTH AMERICA
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Rhythms in Upper Pennsylvanian Cyclothems, And, Thickness of Glacial Drift in Du Page County, Illinois (Classic Reprint)
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New Insights Into Carboniferous Cyclothems, The Fourth Biennial Field Conference of the AAPG Mid-Continent Section
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Spores in strata of late Pennsylvanian cyclothems in the Illinois Basin / R.A. Peppers. Volume Illinois State Geological Survey Bulletin No. 90 1964 [Leather Bound]
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A FIELD TRIp GUIDEBOOK: HIGH-RESOLUTION EVEN STRATIGRAPHY GREENHORN CYCLOTHEM.
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Cyclothem
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![Spores in strata of late Pennsylvanian cyclothems in the Illinois Basin / R.A. Peppers. Volume Illinois State Geological Survey Bulletin No. 90 1964 [Leather Bound]](https://m.media-amazon.com/images/I/41qaVm0pKML._SL75_.jpg "Spores in strata of late Pennsylvanian cyclothems in the Illinois Basin / R.A. Peppers. Volume Illinois State Geological Survey Bulletin No. 90 1964 [Leather Bound]")
