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  1. By: Rigby, S J
    Type: Article
    In: Rhodora
    Volume: 75
    Date: 1973
    Page Range: 122--131
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  2. By: Rigby, S J - Britton, Donald M.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 84
    Issue: 2
    Date: 1970
    Page Range: 137--144
    Publication Info: Ottawa Ottawa Field-Naturalists' Club