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  1. By: Risser, Paul G. - Illinois. Natural History Survey Division
    Publication info: Champaign, Ill, State of Illinois, Dept. of Energy and Natural Resources, Natural History Survey Division, [1984]
    Holding Institution: University Library, University of Illinois Urbana Champaign
  2. By: Risser, Paul G. - Karr, James R. - Forman, Richard T. T.
    Publication info: Champaign, Ill, Illinois Natural History Survey, [1984]
    Holding Institution: University Library, University of Illinois Urbana Champaign