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  1. By: Von Bonde, W.
    Type: Article
    In: Transactions of the Royal Society of South Africa
    Volume: 4
    Date: 1914
    Page Range: 299--303
    Publication Info: Cape Town, Royal Society of South Africa,
  2. By: Von Bonde, W.
    Type: Article
    In: Transactions of the Royal Society of South Africa
    Volume: 7
    Date: 1918
    Page Range: 119--121
    Publication Info: Cape Town, Royal Society of South Africa,