ANALISIS HARDGROVE GRIDABILITY INDEX BATUBARA TERHADAP PRODUKTIVITAS ALAT GALI MUAT DI PT KTCNBL KALIMANTAN TENGAH. (2022). PROCEEDINGS OF NATIONAL COLLOQUIUM RESEARCH AND COMMUNITY SERVICE, 6, 11-15. https://doi.org/10.33019/snppm.v6i0.3681