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  1. Fossil peat of the Illinois basin : a guide to the study of coal balls of Pennsylvanian age /
    By: Phillips, Tom Lee, - Avcin, Matthew J., - Berggren, Dwain,
    Publication info: Urbana :Illinois State Geological Survey,1976.
    Contributed by: University of Illinois Urbana Champaign
    Subjects: Coal balls  Illinois Basin  Paleobotany  Pennsylvanian  
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  2. 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
    Subjects: Coal balls  Illinois  
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