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3. N. E. Cooke (1971). Symposium report on Mercury in Man’s Environment, Environment, 13, no. 4
4. T. Aaronson (1971). ‘Mercury in the Environment’, Environment, 13, no. 4
5. S. C. Gilfillan (1965) ‘Lead Poisoning and the Fall of Rome’, quoted in P. and A. Ehrlich (1970). op. cit., p. 166