“KARAKTERISTIK BATUBARA DAN ATRIBUT CLEAT PADA DAERAH ULAK LEBAR DAN SEKITARNYA, KABUPATEN LAHAT, SUMATERA SELATAN”. PROCEEDINGS OF NATIONAL COLLOQUIUM RESEARCH AND COMMUNITY SERVICE 1 (September 28, 2018). Accessed June 17, 2026. https://journal.ubb.ac.id/index.php/snppm/article/view/546.