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ANALISIS HARDGROVE GRIDABILITY INDEX BATUBARA TERHADAP PRODUKTIVITAS ALAT GALI MUAT DI PT KTCNBL KALIMANTAN TENGAH. SNPPM [Internet]. 2022 Dec. 22 [cited 2026 Apr. 30];6:11-5. Available from: https://journal.ubb.ac.id/index.php/snppm/article/view/3681