Zubair A, Ali SI. THE VARIATION OF CALCIUM, MAGNESIUM, SODIUM, POTASSIUM AND BICARBO­ NATE CONCENTRATION, pH AND CONDUCTIVITY IN GROUNDWATER OF KARACHI REGION. Pakistan Journal of Scientific & Industrial Research [Internet]. 2002 Apr. 22 [cited 2025 Jun. 8];45(3):151-6. Available from: http://www.biostaging.pjsir.org/index.php/biological-sciences/article/view/1775