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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Penland, C William
    Type: Article
    In: Rhodora
    Volume: 26
    Date: 1924
    Page Range: 61--79
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  2. By: Penland, C William
    Type: Article
    In: Contributions from the Gray Herbarium of Harvard University
    Issue: 71
    Date: 1924
    Page Range: 61--79
    Publication Info: [Cambridge, Mass.] Harvard University -1984]