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  1. 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  
  2. By: Shaw, Thomas H. (Thomas Howard) - Sargent, Michael L. (Michael Leroy) - Illinois State Geological Survey.
    Publication info: Champaign, Ill, Illinois State Geological Survey, 1989
    Holding Institution: University Library, University of Illinois Urbana Champaign
    Subjects: Borings  Catalogs  Geology  Geology, Stratigraphic  Geophysical methods  Illinois Basin  Natural gas  Paleozoic  Prospecting  
  3. By: Peppers, Russel Allen, - Harvey, Richard D. (Richard David), - Illinois State Geological Survey.
    Publication info: Champaign, Ill, Dept. of Natural Resources, Illinois State Geological Survey, 1997
    Holding Institution: University Library, University of Illinois Urbana Champaign
    Subjects: Algae, Fossil  Analysis  Coal  Illinois Basin  Paleobotany  Spores (Botany), Fossil  Torbanite