Application of coal mine roof rating (CMRR) to extended cuts

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作者：
Mark, C. [1 ]
机构：
[1] Natl. Inst. Occup. Safety and Hlth., Pittsburgh Research Laboratory, Pittsburgh, PA, United States
来源：
Mining Engineering | 1999年 / 51卷 / 04期
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页码：52 / 56
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