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  1. By: Copp, G. Gordon
    Type: Article
    In: Journal of the New York Botanical Garden
    Volume: 7
    Issue: 74
    Date: 1906-02
    Page Range: 26--29
    Publication Info: Lancaster, Pa, Published for the Garden by the New Era Printing Co, 1900-
  2. By: Copp, G. Gordon
    Type: Article
    In: Journal of the New York Botanical Garden
    Volume: 5
    Issue: 54
    Date: 1905-06
    Page Range: 112--118
    Publication Info: Lancaster, Pa, Published for the Garden by the New Era Printing Co, 1900-