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DIT. TEKNIK PERTAMBANGAN SUB. DIT. KONSERVASI JKT.
USAHA PEJUANG REPUBLIK INDONESIA (UPRI)
PERTAMINA UPPDN V SURABAYA
ASHTON MERCUA BUANA MINING, PT
Process Laboratories Research and Development Centre for oil and Gas Technology
Project no. 61C0148 Department of Refining and Petrochemistry Indonesian Petroleum Institute
KOBAYASHI Teiichi and R Toriyama
BRITISH, Geomorphological Reserch Group