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  1. By: Grobbelaar, Coert Smit
    Type: Article
    In: Transactions of the Royal Society of South Africa
    Volume: 10
    Date: 1922
    Page Range: 181--200
    Publication Info: Cape Town, Royal Society of South Africa,
  2. By: Grobbelaar, Coert Smit
    Type: Article
    In: Annals of the Transvaal Museum
    Volume: 7
    Date: 1921
    Page Range: 245--261
    Publication Info: Pretoria, Transvaal Museum, [1911]-2009