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Brock, W.  (2009, January 08). Praagh, Gordon Van (1909–2003), chemist and educationist. Oxford Dictionary of National Biography. Retrieved 21 Apr. 2021, from https://www.oxforddnb.com/view/10.1093/ref:odnb/9780198614128.001.0001/odnb-9780198614128-e-95079.