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2. N.F. Gray, Drinking Water Quality. Problems and Solutions, Wiley, Chichester, 1994.

3. G.A. Best and A.D. Ruthven, Pesticides - Developments, Impacts and Controls, Royal Society of Chemistry, London, 1995.

4. The Indirect Effect of Pesticides on Birds, Report by UK Joint Nature Conservation Committee, Natural History Book Service, Totnes, Devon.

5. C.H. Edwards (ed.), Environmental Pollution by Pesticides, Plenum Press, London, 1973.

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