GROUNDWATER DEPLETION IN THE UPPER AQUIFER OF THE CHAD FORMATION, CHAD BASIN, NORTH-EASTERN NIGERIA. Nigerian Journal of Technology, [S. l.], v. 39, n. 2, p. 621–631, 2020. Disponível em: https://nijotech.com/index.php/nijotech/article/view/2316. Acesso em: 5 may. 2026.