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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Webber, J M - Ball, Peter W. (Peter William),
    Type: Article
    In: Rhodora
    Volume: 82
    Date: 1980
    Page Range: 281--304
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  2. By: Webber, J M - McLeod, D. - Bobbette, R S W
    Type: Article
    In: The Canadian field-naturalist
    Volume: 99
    Issue: 2
    Date: 1985
    Page Range: 141--146
    Publication Info: Ottawa Ottawa Field-Naturalists' Club