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  1. An Early Pennsylvanian flora with megalopteris and noeggerathiales from west-central Illinois /
    By: Leary, Richard L. - Pfefferkorn, H. W., - Illinois State Museum.
    Publication info: Urbana :Illinois State Geological Survey,1977.
    Contributed by: University of Illinois Urbana Champaign
    View Book
  2. Early Pennsylvanian paleotopography and depositional environments, Rock Island County, Illinois /
    By: Leary, Richard L. - Trask, C. Brian. - Geological Society of America.
    Publication info: Champaign, Ill. :Illinois State Geological Survey,1985.
    Contributed by: University of Illinois Urbana Champaign
    View Book