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  1. By: Pels, Simon
    Type: Article
    In: Journal and proceedings of the Royal Society of New South Wales
    Volume: 97
    Issue: 4
    Date: 1964-07-02
    Page Range: 107--115
    Publication Info: Sydney C. Potter, Acting. Govt. Printer 1877-
  2. By: Pels, Simon
    Type: Article
    In: Journal and proceedings of the Royal Society of New South Wales
    Volume: 102
    Issue: 3-4
    Date: 1970-11-09
    Page Range: 189--195
    Publication Info: Sydney C. Potter, Acting. Govt. Printer 1877-