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  1. By: Helms, R
    Type: Article
    In: Proceedings of the Linnean Society of New South Wales
    Volume: 10
    Date: 1896
    Page Range: 387--408
    Publication Info: Sydney Linnean Society of New South Wales
  2. By: David, Tannatt William Edgeworth - Helms, R - Pittman, E F
    Type: Article
    In: Proceedings of the Linnean Society of New South Wales
    Volume: 26
    Date: 1999
    Page Range: 26--74
    Publication Info: Sydney Linnean Society of New South Wales
  3. By: Helms, R
    Type: Article
    In: Proceedings of the Linnean Society of New South Wales
    Volume: 8
    Date: 1894
    Page Range: 349--364
    Publication Info: Sydney Linnean Society of New South Wales