Preliminary probe into spontaneous combustion mark gases on main - mining coal seam in pingdingshan coal industry group 平煤集团主采煤层的自然发火标志气体初探
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Characteristics of faults in main seams of laoyingshan mine and their influence upon arrangement of development and working faces 老鹰山矿主采煤层内断层的特征及其对采掘工作面布置的影响