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  1. By: Helby, R
    Type: Article
    In: Journal and proceedings of the Royal Society of New South Wales
    Volume: 100
    Issue: 2
    Date: 1967-05-25
    Page Range: 61--73
    Publication Info: Sydney C. Potter, Acting. Govt. Printer 1877-
  2. By: Helby, R - Hamilton, L H - Taylor, Geoffrey Hamlet
    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: 169--171
    Publication Info: Sydney C. Potter, Acting. Govt. Printer 1877-
  3. By: Lennox, M - Helby, R - Roberts, J
    Type: Article
    In: Journal and proceedings of the Royal Society of New South Wales
    Volume: 119
    Issue: 1-2
    Date: 1986-12
    Page Range: 33--42
    Publication Info: Sydney C. Potter, Acting. Govt. Printer 1877-