Zubair, A. and Ali, S. I. (2002) “THE VARIATION OF CALCIUM, MAGNESIUM, SODIUM, POTASSIUM AND BICARBO­ NATE CONCENTRATION, pH AND CONDUCTIVITY IN GROUNDWATER OF KARACHI REGION”, Biological Sciences - PJSIR, 45(3), pp. 151–156. Available at: https://v2.pjsir.org/index.php/biological-sciences/article/view/1775 (Accessed: 19 May 2024).