ANALYSIS OF DIFFERENT CONCEPTS OF PILLAR STRENGTH CALCULATIONS FOR USA COAL MINING CONDITIONS.

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作者：
Krzyszton, Danuta [1 ]
机构：
[1] Politechnika Slaskov, Inst, Mechanizacji Gornictwa, Gliwice, Pol, Politechnika Slaskov, Inst Mechanizacji Gornictwa, Gliwice, Pol
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| 1600年 / 29期
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摘要：
COAL MINES AND MINING
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