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Morris, P.  (2007, October 04). Pyke, Geoffrey Nathaniel Joseph (1893–1948), educationist and inventor. Oxford Dictionary of National Biography. Retrieved 9 May. 2021, from https://www.oxforddnb.com/view/10.1093/ref:odnb/9780198614128.001.0001/odnb-9780198614128-e-92810.