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Rahmi, E.; Suwardi, S.; Sumawinata, B. Characterization of Humic Substance Extracted from Andisols, Spodosols, Peat, and Lignite. Sains Tanah J. Soil Sci. Agroclimatology 2018, 15 (1), 35-45. https://doi.org/10.15608/stjssa.v15i1.21622.