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'Mackellar, Helen Watt (1900–1984)', People Australia, National Centre of Biography, Australian National University, https://peopleaustralia.anu.edu.au/biography/mackellar-helen-watt-20358/text, accessed 27 March 2023.
1900
Woollahra, Sydney, New South Wales, Australia
29 November,
1984
(aged ~ 84)
New South Wales, Australia