A’yun, Q., Hanik, N. R. . and 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), pp. 310–315. doi: 10.29303/jbt.v23i3.5086.