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'Johnston, George Horatio (1833–1904)', People Australia, National Centre of Biography, Australian National University, https://peopleaustralia.anu.edu.au/biography/johnston-george-horatio-25756/text, accessed 2 April 2023.
6 November,
1833
Sydney, New South Wales, Australia
20 December,
1904
(aged 71)
Stanmore, Sydney, New South Wales, Australia