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Surrounding rock control technology of large depth buried of three soft thick coal seam with one-time fully mining hight
 Fu Hui 1, 2
1. State Key Laboratory of Coking Coal Resources Development and Comprehensive Utilization,
China Pingdingshan Mining Shenma Group, Pingdingshan 467000, China; 2. Pingdingshan Coal Mining and Utilization Research Institute, Pingdingshan 467000, China


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