1. The Registrar-General's Decennial Supplement , England and Wales, 1921, Part II, Occupational Mortality, Fertility, and Infant Mortality 1927 His Majesty's Stationery Office
2. The Registrar-General's Decennial Supplement , England and Wales, 1931, Part IIa, Occupational Mortality 1938 His Majesty's Stationery Office