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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 5 March 2021.
6 March 1836
Annandale, Sydney, New South Wales, Australia
28 October 1896
Dulwich Hill, Sydney, New South Wales, Australia