Environmental Effects of Sand and Gravel Mining on Land and Soil in Luku, North Central Nigeria. Global Journal of Science Frontier Research, [S. l.], v. 14, n. H2, p. 7–15, 2014. Disponível em: https://www.journalofscience.org/index.php/GJSFR/article/view/1282. Acesso em: 15 aug. 2026.