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"COAL MINING, MINERALS, OIL AND GAS"
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BRIKET BATUBARA SEBAGAI ENERGI ALTERNATIF PENGGANTI MINYAK TANAH Oleh. Edy Jamal Tuheteru *) Bahan bakar minyak dalam...
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COAL MINING Coal mining process is largely determined by the geological elements of coal sludge . In general , there are two coal minin...
