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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Pollard, Gordon C. (Gordon Clark), - Mangelsdorf, Paul C
    Type: Article
    In: Botanical Museum leaflets, Harvard University
    Volume: 24
    Issue: 3
    Date: 1975-01-10
    Page Range: 49--64
    Publication Info: Cambridge, Mass Botanical Museum, Harvard University 1932-