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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Irwin, Henry - Barghoorn, Elso S. (Elso Sterrenberg),
    Type: Article
    In: Botanical Museum leaflets, Harvard University
    Volume: 21
    Issue: 2
    Date: 1965-10-29
    Page Range: 37--57
    Publication Info: Cambridge, Mass Botanical Museum, Harvard University 1932-