“KANDUNGAN TEMBAGA, SENG, DAN BESI DALAM SEDIMEN SUNGAI BOLAANG DI DESA BAKAN BOLAANG MONGONDOW”. Soil and Environment Journal, vol. 1, no. 2, Mar. 2022, pp. 22-25, https://doi.org/10.35791/se.22.1.2022.39883.