INVESTIGATION OF GROUNDWATER QUALITY VARIATIONS ALONG WADI NAJRAN, NAJRAN, KINGDOM OF SAUDI ARABIA . EPH-International Journal of Applied Science, [S. l.], v. 6, n. 4, p. 10–13, 2020. DOI: 10.53555/eijas.v6i4.77. Disponível em: http://eijas.com/index.php/as/article/view/77. Acesso em: 15 sep. 2025.