Report no. 63, The Batang Hari - Sungai Sangir anomaly area of retention: PT. Riotinto Bethlehem Indonesia
Laporan penyelidikan bahan bahan galian daerah Tanah Grogot Kabupaten Pasir Kalimantan Timur
Report No. 63 The Batang Hari - Sungai Sangir anomaly area retention: PT Riotinto Bethlehem Indonesia