OPTICAL PROPERTIES OF SOME TERTIARY COALS FROM KUTAI BASIN INDONESIA THEIR DEPOSITIONAL ENVIRONMENTS AND HYDROCARBON POTENTIAL. Jurnal Geologi Pertambangan (JGP), [S. l.], v. 2, n. 20, 2016. DOI: 10.53640/jgp.v2i20.206. Disponível em: https://ejurnal.unikarta.ac.id/index.php/jgp/article/view/206. Acesso em: 24 aug. 2025.