CONAN DOYLE, Sir Arthur (1859-1930). Autograph letter signed ('A. Conan Doyle') to an unnamed female recipient, Undershaw, Hindhead, [n.d.], requesting information on the 'actions in the war after Sept 1st', asking to see any letters which are relevant [possibly part of his research for The British Campaign in France and Flanders, (1916 to 1919)], one page, 8vo.