Application of geophysical exploring methods for observing rock failure in the mining of coal seams menaced by waterbodies : Liu Zongcai; Sun Zhengpeng; Gao Hang; Li Baiying; Yu Shijian; Li Jiaxiang; Zeng Ruihua In: Research and Engineering Applications in Rock Masses (paper to the 26th US Symposium on Rock Mechanics, Rapid City, 26–28 June 1985) V2, P985–992. Publ Rotterdam: A. A. Balkema, 1985

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