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Schaaf, L.  (2004, September 23). Spiller, John (1833–1921), chemist and inventor of photographic techniques. Oxford Dictionary of National Biography. Retrieved 27 May. 2020, from https://www.oxforddnb.com/view/10.1093/ref:odnb/9780198614128.001.0001/odnb-9780198614128-e-54081.