Formation Mechanism and the Height of the Water-Conducting Fractured Zone Induced by Middle Deep Coal Seam Mining in a Sandy Region: A Case Study from the Xiaobaodang Coal Mine by Xiaoshen Xie, Enke Hou, Shuangming Wang, Xueyang Sun, Pengfei Hou, Shibin Wang, Yongli Xie, Yongan Huang

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