Perbedaan Antara Pasir Sungai Dan Pasir Yang Diproduksi

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Dampak negatif penambangan pasir besi.Studi kasus dermaga linau kecamatan maje kabupaten kaur september 22, 2011 abstrak aktifitas pertambangan dianggap seperti uang logam yang memiliki dua sisi yang saling berlawanan.

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