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Key Groundwater Control Factors of Deep Buried Coalfield by Landform and Sedimentation in the Northern Ordos Basin
Jian Yang, Ji Liu, Hao Huang, Xiangyang Liang
图3 煤层顶板砂泥岩互层结构(以纳林河二号矿为例)
Fig.3 Cross-section of sand-mudstone interbedding on coal seam roof