Yuliana, Yuliana, Djayus Djayus, Rahmiati Munir, & Supriyanto supriyanto.
" ANALISIS HUBUNGAN NILAI HGI (HARDGROVE GRINDABILITY INDEX) ASH CONTENT INHERENT MOISTURE DAN TOTAL SULFUR TERHADAP NILAI KALORI BATUBARA DI PT. GEOSERVICES SAMARINDA KALIMANTAN TIMUR." <em>GEOSAINS KUTAI BASIN</em> [Online], 5.1 (2022): 31-37. Web.  3 Jul. 2024