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  1. By: Knudson, Lewis, - Smith, R S
    Type: Article
    In: Botanical gazette
    Volume: 68
    Issue: 6
    Date: 1919
    Page Range: 460--466
    Publication Info: Hanover, Ind, [publisher not identified], 1876-1991
  2. By: Smith, R S - Ladd, Philip G
    Type: Article
    In: Journal of the Royal Society of Western Australia
    Volume: 77
    Issue: 3
    Date: 1994
    Page Range: 71--79
    Publication Info: Perth, The Society, 1915