Geochemical Characteristics of the Cretaceous Emewe–Efopa Coal in the Northern Anambra Basin of Nigeria. Communication In Physical Sciences, [S. l.], v. 7, n. 1, p. 14–17, 2021. Disponível em: https://journalcps.com/index.php/volumes/article/view/425. Acesso em: 17 jun. 2026.