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Fossil peat of the Illinois basin : a guide to the study of coal balls of Pennsylvanian age

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By: Phillips, Tom Lee, - Avcin, Matthew J., - Berggren, Dwain,

Publication info: Urbana, Illinois State Geological Survey, 1976

Holding Institution: University Library, University of Illinois Urbana Champaign

Subjects: Coal balls Illinois Basin Paleobotany Pennsylvanian
Geologic investigation of roof and floor strata : longwall demonstration, Old Ben Mine no. 24 : prediction of coal balls in the Herrin coal : final technical report, part 2

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By: DeMaris, Philip J.

Publication info: Champaign, Ill, Illinois Dept. of Energy and Natural Resources, State Geological Survey Division, 1983

Holding Institution: University Library, University of Illinois Urbana Champaign

Subjects: Coal balls Illinois