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  1. By: Dreyer, T F
    Type: Article
    In: Transactions of the Royal Society of South Africa
    Volume: 4
    Date: 1914
    Page Range: 241--258
    Publication Info: Cape Town, Royal Society of South Africa,
  2. By: Dreyer, T F
    Type: Article
    In: Transactions of the Royal Society of South Africa
    Volume: 3
    Date: 1913
    Page Range: 139--146
    Publication Info: Cape Town, Royal Society of South Africa,