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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Howard, Richard A. (Richard Alden), - Dunbar, Henry F.
    Type: Article
    In: Rhodora
    Volume: 66
    Date: 1964
    Page Range: 6--15
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  2. By: Dunbar, Henry F.
    Type: Article
    In: Rhodora
    Volume: 61
    Date: 1959
    Page Range: 21--24
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],