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Santi, G.C. and Rahmayanti, M. 2019. Effect of Solution pH to Indigosol Blue Adsorption on Humic Acid Isolated from Kalimantan Peat Oil. Proceeding International Conference on Science and Engineering. 2, (Mar. 2019), 193–195. DOI:https://doi.org/10.14421/icse.v2.84.