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ANALISIS BIAYA PENAMBANGAN BATUBARA BERDASARKAN NISBAH PENGUPASAN PADA PT. PANCARAN SURYA ABADI KEC. MUARA BADAK KAB. KUTAI KARTANEGARA KALIMANTAN TIMUR (ANALYSIS OF COAL MINING COSTS BASED ON THE STRIPPING RATIO AT PT. PANCARAN SURYA ABADI DISTRICTS M
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