平顶山煤田十三矿二1煤层厚度特征及山西组聚煤规律探讨
평정산매전십삼광이1매층후도특정급산서조취매규률탐토
A Discussion on Ⅱ1 Coal Seam Thickness Features and Shanxi Formation Coal Accumulation Pattern in No.13 Coalmine, Pingdingshan Coalfield
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