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Langer, W.  (2004, September 23). Haast, Sir (John Francis) Julius von [formerly Johann Franz Haast] (1822–1887), geologist and explorer. Oxford Dictionary of National Biography. Retrieved 24 Feb. 2020, from https://www.oxforddnb.com/view/10.1093/ref:odnb/9780198614128.001.0001/odnb-9780198614128-e-11828.