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2. SSSA Book Ser;Koskinen,1990
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4. Official Journal of the European Communities, Council Directive of 15 July 1991 concerning the placing of plant protection products on the market (91/414/EEC). No L 230, 19.8.1991 (1991).
5. United States Environmental Protection Agency, Toxic Substances Control Act, 15 USC s/s 2601 et seq (1976).