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WATER QUALITY ANALYSIS OF CODE RIVER BASED ON METAL AND NONMETAL PARAMETERS USING HEAVY METAL POLLUTION INDEX. J. Geografi [Internet]. 2021 Jun. 3 [cited 2026 Sep. 17];13(2):145-58. Available from: https://jurnal.unimed.ac.id/2012/index.php/geo/article/view/20000