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Powell, John P. 1994, Placenames of the Greater Hawkesbury Region, Hawkesbury River Enterprises, Berowra, p.106. Australian Coin Review, Dec. 1983, "Early fivers' reverse traced to Brooklyn", pp.23-4. Johnson, Noel E. 1993, History of Brooklyn, Brooklyn, pp.6-7, Sanatorium Rock. Hornsby Shire, accessed 13/09/2024, https://hornsbyshire.recollect.co.nz/nodes/view/6218