1. Size and Morale;Trust, Acton Society,1953
2. The Investigation of Atmospheric Pollution;Daly, C.;Brit. med. J,1954
3. Winter Fog and Mist Investigations in the British Isles 1930-7;Durst, C.S.;Brit. med. J,1940
4. Lowe, C. R. (1956). Ibid., 2, 1081.
5. Oswald, N. E., and Medvei, V. C. (1955). Lancet, 2, 843.