KAMLESH VERMA; VINAY KUMAR RAI. Assessment of drinking water quality supplied to primary schools: A case study of Ballia city, Uttar Pradesh. National Geographical Journal of India , [S. l.], v. 67, n. 4, p. 414–425, 2021. Disponível em: http://65.0.158.54/index.php/ngji/article/view/297. Acesso em: 12 jul. 2025.