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Ishak, I., Jura, M.R., Said, I. and Pulukadang, S.H.V. 2022. The Hardness and The Testing of Acidity (pH) on The Groundwater in Mapane Tambu Balaesang District, Donggala Regency. Media Eksakta. 18, 2 (Nov. 2022), 102–107. DOI:https://doi.org/10.22487/me.v18i2.2345.