“HEAVY METAL CONCENTRATION IN MARINE SEDIMENTS AND VEGETATION ( CALTHA PALUSTRVIS ) FROM RIVER RAMOS IN BAYELSA AND DELTA STATES OF NIGERIA”, Pakistan Journal of Scientific & Industrial Research, vol. 45, no. 2, pp. 111–113, Apr. 2002, Accessed: Mar. 10, 2026. [Online]. Available: https://www.v2.pjsir.org/index.php/biological-sciences/article/view/1765