ZHAO Yu-fang. Retrospect and discussion on drilling efficiency and drilling equipment for coal field[J]. COAL GEOLOGY & EXPLORATION, 1991, 19(4): 64-67.
Citation: ZHAO Yu-fang. Retrospect and discussion on drilling efficiency and drilling equipment for coal field[J]. COAL GEOLOGY & EXPLORATION, 1991, 19(4): 64-67.
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Retrospect and discussion on drilling efficiency and drilling equipment for coal field

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