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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Hill, L M - Rogers, O M
    Type: Article
    In: Rhodora
    Volume: 75
    Date: 1973
    Page Range: 1--25
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  2. By: Hill, L Michael - Rogers, O M
    Type: Article
    In: Rhodora
    Volume: 72
    Date: 1970
    Page Range: 437--438
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],