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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 /

By Philip J. DeMaris


Contract Reports 1983-

Topics: Coal balls, Illinois
Publisher: Champaign, Ill. :Illinois Dept. of Energy and Natural Resources, State Geological Survey Division,1983.
Year: 1983
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