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  1. By: Nixon, Charles M. - Hansen, Lonnie P. - Illinois. Section of Wildlife Research.
    Publication info: [Illinois], Illinois Natural History Survey Section of Wildlife Research, 20 September 1983
    Holding Institution: University Library, University of Illinois Urbana Champaign
  2. By: Nixon, Charles M. - Illinois. Natural History Survey Division
    Publication info: Champaign, Ill, Illinois Natural History Survey, 1994
    Holding Institution: University Library, University of Illinois Urbana Champaign