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Laporan survey pertambangan di daerah kecamatan Sungai Ayak, Kabupaten Sanggau, Propinsi Kalimantan Barat: berdasarkan SKIP No. 374/Kpts/DBP/74, tanggal 30 September 1974
author: Moon Yong, Lee
publisher: Timbang Utara
date created: 1974