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2. Water Quality Criteria for Freshwater Fish,1982
3. Concentration of cadmium, copper, lead and zinc in six species of freshwater calms;Anderson;Bull. Environ. Contamin. Toxicol.,1977
4. The Use of Anodonta piscinalis as Indicator Organism for PAH in Fresh Water (NIVA note F-80418) [in Norwegian];Berglind,1981
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