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  1. By: McConnochie, Kenneth - Likens, Gene E.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 83
    Issue: 2
    Date: 1969
    Page Range: 147--154
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Likens, Gene E.
    Type: Article
    In: Gayana. Botánica
    Date: 2003-01-01