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'Johnston, Robert Percival (1836–1896)', People Australia, National Centre of Biography, Australian National University, https://peopleaustralia.anu.edu.au/biography/johnston-robert-percival-25758/text, accessed 25 June 2022.
6 March,
1836
Annandale, Sydney, New South Wales, Australia
28 October,
1896
(aged 60)
Dulwich Hill, Sydney, New South Wales, Australia