Gaya APA

LTD., S, C, M, C. (1975). Rehabilitation and Expansion Plans of Ombilin Coal Mine : Vol. I Current Situation and Some Problems of ombilin Coal Mine . : Sumitomo Coal Mining Co., LTD..

Gaya MLA

LTD., Sumitomo, Coal, Mining, Co.,. "Rehabilitation and Expansion Plans of Ombilin Coal Mine : Vol. I Current Situation and Some Problems of ombilin Coal Mine". : Sumitomo Coal Mining Co., LTD., 1975. Text.