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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Parker, Bruce C - Bleck, John.
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 53
    Date: 1966
    Page Range: 1--16
    Publication Info: St. Louis, Missouri Botanical Garden Press, 1914-
  2. By: Ferren, Wayne R. - Bleck, John. - Vivrette, Nancy
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 28
    Date: 1981
    Page Range: 80--85
    Publication Info: Berkeley, California Botanical Society,