ONTUMBI, George M.; UCAKUWUN, Elias K.; MUNYAO, Thomas M. Variation of Fluoride Levels in Surface Geology: A Study of River Njoro Catchment, Kenya . African Journal of Education,Science and Technology (AJEST), [S. l.], v. 6, n. 1, p. Pg 1–8, 2020. Disponível em: https://ajest.org/index.php/ajest/article/view/82. Acesso em: 11 may. 2026.