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Burnley, J., & Lawrence, P.  (2004, September 23). Gregorie [Gregory], David (1625–1720), physician and inventor of a cannon. Oxford Dictionary of National Biography. Retrieved 5 Apr. 2020, from https://www.oxforddnb.com/view/10.1093/ref:odnb/9780198614128.001.0001/odnb-9780198614128-e-11457.