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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Irwin, Michael E - Lynborg, Leif
    Type: Article
    In: Bulletin
    Volume: 32
    Date: 1981-11
    Page Range: 193--277
    Publication Info: Urbana State of Illinois, Dept. of Registration and Education, Natural History Survey Division 1918-1985