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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Plocher, Allen E. - Matthews, Jeffrey W. - Warwick, Charles. - Illinois. Natural History Survey Division - Illinois. Department of Transportation. Wetland Vegetative and Soils Survey Program.
    Publication info: Champaign, Ill, Illinois Natural History Survey, 2004
    Holding Institution: University Library, University of Illinois Urbana Champaign