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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Watson, Thomas J.
    Type: Article
    In: Rhodora
    Volume: 79
    Date: 1977
    Page Range: 1--16.
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  2. By: Watson, Thomas J.
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 25
    Date: 1978
    Page Range: 205--210
    Publication Info: Berkeley, California Botanical Society,
  3. By: Witherspoon, John T - Watson, Thomas J.
    Type: Article
    In: Rhodora
    Volume: 77
    Date: 1975
    Page Range: 435--435
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],