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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Stoeckel, Denise B. - Blodgett, K. Douglas (Kevin Douglas), - Sparks, Richard E. - Illinois. Center for Aquatic Ecology. - Illinois. Dept. of Natural Resources.
    Publication info: Champaign, Ill, Illinois Natural History Survey, Jan. 1997
    Holding Institution: Lewis & Clark Community College / NGRREC