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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Schmidt, B. Christian (Bjorn Christian),
    Type: Article
    In: ZooKeys
    Volume: 39
    Date: 2010
    Page Range: 205-223
    Publication Info: Pensoft Publishers 2010
    Subjects: Aspen two-leaf tier  Canada  Cosmiina  North America  taxonomy  United States