4 1 20 S. Tjokrosapoetro Primary Author T. Budhitrisna Primary Author C.J. Pigram Primary Author A.B. Challinor Primary Author F. Hasibuan Primary Author E. Rusmana Primary Author U. Hartono Primary Author Duncan D. Bow Primary Author Udi Hartono Primary Author mixed material Departemen Pertambangan dan Energi 1982 100.000 Rusmana, E Primary Author Suwitodirdjo, K Primary Author Suharsono Primary Author mixed material Jakarta Pusat Penelitian dan Pengembangan Geologi 1982 C-2018090782.jpg.jpg Rusmana Additional Author Priatna, Ferry Additional Author Campbell, Hamish Additional Author mixed material Jakarta Antam 1988 Rusmana Additional Author Priatna, Ferry Additional Author Campbell, Hamish Additional Author mixed material Jakarta Antam 1987