Rahmawati, M., Sari, S., Triyoga, A., & wati, I. (2018). Characteristics of Coal and Cleat Attributes in Ulak Lebar and Surroundings Area, Lahat Regency, South Sumatra. Journal Of Geoscience, Engineering, Environment, And Technology, 3(2), 116-122. doi:10.24273/jgeet.2018.3.2.586