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  1. By: Cummings, Kevin S. - Mayer, Christine A.
    Publication info: Champaign, IL, Illinois Natural History Survey, 1992
    Holding Institution: University Library, University of Illinois Urbana Champaign
  2. By: Forbes, Stephen Alfred, - Mayer, Christine A. - Methven, K. - Phillippe, Loy R.
    Publication info: [Champaign, Ill.], Illinois Natural History Survey, [1994]
    Holding Institution: University Library, University of Illinois Urbana Champaign