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  1. By: Lingen, J. Steph. van der
    Type: Article
    In: Transactions of the Royal Society of South Africa
    Volume: 7
    Date: 1918
    Page Range: 59--63
    Publication Info: Cape Town, Royal Society of South Africa,
  2. By: Lingen, J. Steph. van der - Walker, A. R. E.
    Type: Article
    In: Transactions of the Royal Society of South Africa
    Volume: 10
    Date: 1922
    Page Range: 239--244
    Publication Info: Cape Town, Royal Society of South Africa,
  3. By: Lingen, J. Steph. van der
    Type: Article
    In: Transactions of the Royal Society of South Africa
    Volume: 5
    Date: 1915
    Page Range: 45--51
    Publication Info: Cape Town, Royal Society of South Africa,
  4. By: Lingen, J. Steph. van der
    Type: Article
    In: Transactions of the Royal Society of South Africa
    Volume: 6
    Date: 1917
    Page Range: 203--204
    Publication Info: Cape Town, Royal Society of South Africa,
  5. By: Lingen, J. Steph. van der
    Type: Article
    In: Transactions of the Royal Society of South Africa
    Volume: 5
    Date: 1915
    Page Range: 599--602
    Publication Info: Cape Town, Royal Society of South Africa,