Book
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Laporan kegiatan eksplorasi endapan emas, perak dan mineral pengikutnya daerah Lumbanjulu, Prop. Sumatera Utara SKIP No. 12.K/20.01/DDPT/1998 : PKL No. 05/D-P/22/1998
author: Unit Geologi
publisher: Antam – Unit Geologi
date created: 1998