A’yun, Q., Hanik, N. R. ., & Eskundari, R. D. . (2023). Analysis of Hardness Level and pH of Drilled Well Water in Semin Village, Semin District, Gunungkidul Regency. Jurnal Biologi Tropis, 23(3), 310–315. https://doi.org/10.29303/jbt.v23i3.5086