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(2004, September 23). Delaval, Sir John, third baronet (bap. 1654, d. 1729). Oxford Dictionary of National Biography. Retrieved 21 Aug. 2019, from https://www.oxforddnb.com/view/10.1093/ref:odnb/9780198614128.001.0001/odnb-9780198614128-e-76463.