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Baigent, E.  (2008, January 03). Roy, William (1726–1790), surveyor and founder of the Ordnance Survey. Oxford Dictionary of National Biography. Retrieved 8 May. 2021, from https://www.oxforddnb.com/view/10.1093/ref:odnb/9780198614128.001.0001/odnb-9780198614128-e-24236.