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  1. By: Illinois. Dept. of Energy and Natural Resources. - Nature of Illinois Foundation.
    Publication info: [Springfield, Ill.?], Ill. Dept. of Energy and Natural Resources, the Nature of Ill. Foundation, 1994
    Holding Institution: University Library, University of Illinois Urbana Champaign
  2. By: Society for the Illinois Scientific Surveys. - Nature of Illinois Foundation.
    Publication info: [Springfield, Ill.], Society for the Illinois Scientific Surveys, 1986-
    Holding Institution: University Library, University of Illinois Urbana Champaign