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  1. By: Simons, Lewis
    Type: Article
    In: Transactions of the Royal Society of South Africa
    Volume: 9
    Date: 1921
    Page Range: 297--299
    Publication Info: Cape Town, Royal Society of South Africa,
  2. By: Simons, Lewis
    Type: Article
    In: Transactions of the Royal Society of South Africa
    Volume: 8
    Date: 1919
    Page Range: 73--86
    Publication Info: Cape Town, Royal Society of South Africa,