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  1. By: Thomson, R B
    Type: Article
    In: Transactions of the Royal Society of South Africa
    Volume: 3
    Date: 1913
    Page Range: 365--378
    Publication Info: Cape Town, Royal Society of South Africa,
  2. By: Thomson, R B
    Type: Article
    In: Botanical gazette
    Volume: 57
    Issue: 3
    Date: 1914
    Page Range: 247--248
    Publication Info: Hanover, Ind, [publisher not identified], 1876-1991
  3. By: Thomson, R B
    Type: Article
    In: Botanical gazette
    Volume: 57
    Issue: 3
    Date: 1914
    Page Range: 245--247
    Publication Info: Hanover, Ind, [publisher not identified], 1876-1991