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  1. By: Pettit, N E - Ladd, P G - Froend, R H
    Type: Article
    In: Journal of the Royal Society of Western Australia
    Volume: 81
    Issue: 2
    Date: 1998
    Page Range: 95--106
    Publication Info: Perth, The Society, 1915
  2. By: Pettit, N E - Froend, R H
    Type: Article
    In: Journal of the Royal Society of Western Australia
    Volume: 83
    Issue: 2
    Date: 2000
    Page Range: 65--74
    Publication Info: Perth, The Society, 1915