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studi tentang efek harmonisa dalam daya di tambang batu bara

Beberapa hasil tambang banyak dimanfaatkan di dalam negeri dan sebagian lagi juga diekspor ke beberapa negara, bisa dikatakan hasil pertambangan telah menjadi sumber pendapatan bagi negara. Dibalik manfaat yang bisa kita rasakan dari kegiatan pertambangan, ternyata dapat juga menimbulkan efek atau dampak negatif.

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