1. Cook, J. W., Carruthers, W., and Woodhouse, D. L. (1958). Brit. nmed. Bull., 14, 132.
2. Cruickshank, C. N. D. and Squire, J. R. (1950). Brit. J. industr. Med., 7, 1.
3. Fife, J. G. (1962). Ibid., 19, 123.
4. Cancer of the Scrotum in Relation to Occupation;Henry, S.A.;Chief Inspector of Factories; Annual Report on Industrial Health,1946
5. Leitch, A. (1922). Brit. med. J., 2, 1104.