RAHMAWATI, Mutia Armilia et al. Characteristics of Coal and Cleat Attributes in Ulak Lebar and Surroundings Area, Lahat Regency, South Sumatra. Journal of Geoscience, Engineering, Environment, and Technology, [S.l.], v. 3, n. 2, p. 116-122, june 2018. ISSN 2541-5794. Available at: <http://journal.uir.ac.id/index.php/JGEET/article/view/586>. Date accessed: 17 sep. 2019. doi: https://doi.org/10.24273/jgeet.2018.3.2.586.