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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Jones, Robert L. (Robert Lewis), - Hanson, Harold C. (Harold Carsten), - Ziegler, Eugene L. - Illinois. Natural History Survey Division
    Publication info: Champaign, Ill, Illinois Natural History Survey, 1987
    Holding Institution: University Library, University of Illinois Urbana Champaign