A Comparative Study Of Upstream And Downstream Water Quality Of Warri River, In Delta State, Southern Nigeria. coou African Journal of Environmental Research, [S. l.], v. 4, n. 2, p. 42–53, 2023. Disponível em: https://ajer.org.ng/index.php/journal/article/view/102. Acesso em: 30 apr. 2026.