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Weekly numbers of deaths from influenza in Derbyshire from the week ending 29 June 1918 until the week ending 3 May 1919. (Source: Registrar-General, Supplement to the eighty-first annual report of the Registrar-General, Report on the mortality from influenza in England and Wales during the epidemic of 1918–19, London, HMSO, 1920. Figures provided by Niall Johnson.)
