山西陵川地区上石炭统-下二叠统太原组15#煤层成煤环境分析
산서릉천지구상석탄통-하이첩통태원조15#매층성매배경분석
Analysis of Upper Carboniferous-Lower Permian Taiyuan Formation Coal Seam No.15 Coal-forming Environment in Lingchuan Area, Shanxi
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