Maceral Characterization of the Cretaceous Effin – Okai Coal De-posit in Northern Anambra Basin, Nigeria. Communication In Physical Sciences, [S. l.], v. 5, n. 3, p. 223–232, 2020. Disponível em: https://journalcps.com/index.php/volumes/article/view/319. Acesso em: 10 jun. 2026.