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By "DeMaris, Philip J. "
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: DeMaris, Philip J.
Publication info: Champaign, Ill. :Illinois Dept. of Energy and Natural Resources, State Geological Survey Division,1983.
Contributed by: University of Illinois Urbana Champaign