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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Barghoorn, Elso S. (Elso Sterrenberg), - Wolfe, Margaret K - Clisby, Kathryn H
    Type: Article
    In: Botanical Museum leaflets, Harvard University
    Volume: 16
    Issue: 9
    Date: 1954-07-12
    Page Range: 229--240
    Publication Info: Cambridge, Mass Botanical Museum, Harvard University 1932-