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Study on 3137 Top Coal Caving Mining under Deep Large-inclination Angle Complex Geological Condition in Zhaogezhuang Mine
SUN Xiang-qing1, ZHU Ling-qi2,3, GUO Li-wen2,3
1. Eastern Hebei Branch of Hebei Mine Safety Supervision Bureau, Tangshan  063000, China; 2. Mining Engineering Institute, North China University of Technology, Tangshan  063009, China; 3. Hebei Mining Exploration and Safety Technology Key Lab, Tangshan  063009, China


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