3 1 20 Sumaryono Primary Author Suganal Primary Author Hasrifaldi Primary Author Kusna Permana Primary Author Y. Basyuni Primary Author Dwi Handoyo Marmer Primary Author Toni Suryadi Primary Author Wawan Purnawan Primary Author mixed material Bandung Direktora Jenderal Pertambangan Umum 1990 Sumaryono Primary Author Soetjipto Poespokoesomo Primary Author mixed material Bandung Pusat Pengembangan Teknologi Mineral Direktorat Jenderal Pertambangan 1986 Sumaryono Primary Author Kawan Malau Primary Author mixed material Bandung Pusat Pengembangan Teknologi Mineral Direktorat Jenderal Pertambangan 1989