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38- International Symposium on Environmental
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39- J.H. Menner (1976) “Cadmium Toxicity” Dekker,
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40- L.T. Fribera and J.J Vostal, (1972) “Mercury in the
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41- I. Breach, (1976). “Earth in Danger: Part 1,
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42- J.H. Duffus, (1980) “Environmental
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43- J.M. Ratcliffe, (1981). “lead in man and the
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44- Esber Sheen, (1974) Environmental Pollution:
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45- R.W. Raiswell. P. Brimblecombe. D.L. Dent and
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46- Norris Shreve, (1967) Chemical Process Industries,
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47- J. Calvin Giddings, (1973) Chemistry: Man and
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