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  1. By: Roberts, A W
    Type: Article
    In: Transactions of the South African Philosophical Society
    Volume: 8
    Date: 1890
    Page Range: 52--62
    Publication Info: Cape Town, The Society,
  2. By: Roberts, A W
    Type: Article
    In: Transactions of the South African Philosophical Society
    Volume: 8
    Date: 1890
    Page Range: 93--109
    Publication Info: Cape Town, The Society,
  3. By: Roberts, A W
    Type: Article
    In: Transactions of the South African Philosophical Society
    Volume: 8
    Date: 1890
    Page Range: 40--49
    Publication Info: Cape Town, The Society,
  4. By: Roberts, A W
    Type: Article
    In: Transactions of the South African Philosophical Society
    Volume: 8
    Date: 1890
    Page Range: 24--32
    Publication Info: Cape Town, The Society,
  5. By: Roberts, A W
    Type: Article
    In: Transactions of the Royal Society of South Africa
    Volume: 2
    Date: 1910
    Page Range: 1--7
    Publication Info: Cape Town, Royal Society of South Africa,