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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Illinois. Natural History Survey Division - Brigham, Allison Roeske, - Illinois. Environmental Protection Agency.
    Publication info: Urbana, Ill, The Survey, 1979
    Holding Institution: University Library, University of Illinois Urbana Champaign
  2. By: Singh, Krishan P. - Ramamurthy, Ganapathi S. - Illinois. Environmental Protection Agency.
    Publication info: Champaign, Ill, Illinois Institute of Natural Resources, State Water Survey Division, Surface Water Section, 1981
    Holding Institution: University Library, University of Illinois Urbana Champaign
  3. By: Illinois. Environmental Protection Agency.
    Publication info: Springfield, Ill, Illinois Environmental Protection Agency,
    Holding Institution: University Library, University of Illinois Urbana Champaign