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  1. By: Brown, Alexander,
    Type: Article
    In: Transactions of the Royal Society of South Africa
    Volume: 5
    Date: 1915
    Page Range: 653--657
    Publication Info: Cape Town, Royal Society of South Africa,
  2. By: Brown, Alexander,
    Type: Article
    In: Transactions of the Royal Society of South Africa
    Volume: 5
    Date: 1915
    Page Range: 565--570
    Publication Info: Cape Town, Royal Society of South Africa,