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Porter, B.  (2013, May 30). Anderson, Sir Robert (1841–1918), spymaster, detective chief, and author. Oxford Dictionary of National Biography. Retrieved 12 Aug. 2020, from https://www.oxforddnb.com/view/10.1093/ref:odnb/9780198614128.001.0001/odnb-9780198614128-e-41262.