Laporan kegiatan penyelidikan geologi regional di daerah Kwandang - Buroko DU. 300/Sulut - April/Mei 1987
Quarterly Report on Gold Exploration DU 300, Kwandang-Boroko, Sulawesi Utara: 5th Quaterly Report October - December 1988
Quarterly Report on Gold Exploration DU 300, Kwandang-Boroko, Sulawesi Utara: 4th Quaterly Report July - September 1988
Quarterly Report on Gold Exploration DU 300, Kwandang-Boroko, Sulawesi Utara: 3rd Quaterly Report April-June 1988
Quarterly Report on Gold Exploration DU 300, Kwandang-Boroko, Sulawesi Utara: 2nd Quaterly Report January-March 1988
Quarterly Report on Gold Exploration DU 300, Kwandang-Boroko, Sulawesi Utara: 1st Quaterly Report October-December 1987
Quarterly Report on Gold Exploration DU 342, Kwandang-Boroko, Sulawesi Utara: 15th (Last) Quaterly Report April - June 1991
Quarterly Report on Gold Exploration DU 342, Kwandang-Boroko, Sulawesi Utara: 14th Quaterly Report January - March 1991
Quarterly Report on Gold Exploration DU 342, Kwandang-Boroko, Sulawesi Utara: 13th Quaterly Report October - December 1990
Quarterly Report on Gold Exploration DU 342, Kwandang-Boroko, Sulawesi Utara: 12th Quaterly Report July- September 1990
Quarterly Report on Gold Exploration DU 342, Kwandang-Boroko, Sulawesi Utara: 11th Quaterly Report April - June 1990
Quarterly Report on Gold Exploration DU 342, Kwandang-Boroko, Sulawesi Utara: 10th Quaterly Report January - March 1990
Quarterly Report on Gold Exploration DU 342, Kwandang-Boroko, Sulawesi Utara: 9th Quaterly Report October - December 1989
Quarterly Report on Gold Exploration DU 342 (EX DU 300), Kwandang-Boroko, Sulawesi Utara: 8th Quaterly Report July - September 1989
Quarterly Report on Gold Exploration DU 342 (EX DU 300), Kwandang-Boroko, Sulawesi Utara: 7th Quaterly Report April - June 1989
Quarterly Report on Gold Exploration DU 342 (EX DU 300), Kwandang-Boroko, Sulawesi Utara: 6th Quaterly Report January - March 1989