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?VARIATION OF HEAVY METAL CONCENTRATIONS IN WATER AND FRESHWATER FISH IN NIGER DELTA WATERS - A CASE STUDY OF BENIN RIVER. Pakistan Journal of Scientific & Industrial Research [Internet]. 2003 Dec. 22 [cited 2026 Apr. 25];46(6):439-42. Available from: http://www.v2.pjsir.org/index.php/biological-sciences/article/view/1697