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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Keenan, P E
    Type: Article
    In: Rhodora
    Volume: 92
    Date: 1990
    Page Range: 126--128
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  2. By: Keenan, P E
    Type: Article
    In: Rhodora
    Volume: 94
    Date: 1992
    Page Range: 38--42
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],