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  1. By: Bakke, Arthur Laurence, - Erdman, L. W.
    Type: Article
    In: American journal of botany
    Volume: 10
    Issue: 1
    Date: 1923-01
    Page Range: 18--31
    Publication Info: Lancaster, Pa, Published in cooperation with the Botanical Society of America by the Brooklyn Botanic Gardens, 1914-