Way of Increase in Effect of Shallow well Wire-line Core Drilling in Coal Field

Way of Increase in Effect of Shallow well Wire-line Core Drilling in Coal Field[J]. COAL GEOLOGY & EXPLORATION, 1987, 15(4): 61-64.

Citation:

Way of Increase in Effect of Shallow well Wire-line Core Drilling in Coal Field[J]. COAL GEOLOGY & EXPLORATION, 1987, 15(4): 61-64.

Citation:

Way of Increase in Effect of Shallow well Wire-line Core Drilling in Coal Field[J]. COAL GEOLOGY & EXPLORATION, 1987, 15(4): 61-64.

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