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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Heald, F D - Walton, R. C
    Type: Article
    In: American journal of botany
    Volume: 1
    Issue: 10
    Date: 1914-12
    Page Range: 499--521
    Publication Info: Lancaster, Pa, Published in cooperation with the Botanical Society of America by the Brooklyn Botanic Gardens, 1914-