Trace fossils from the Changchengian Zhaojiazhuang Formation in the Taihang Mountains,Hebei;

Mechanical mechanism analysis of water inrush condition on mechanized top-coal caving in steep seam in Zhaogezhuang coal mine;

Evaluation of mining under safe water pressure of aquifer in deep Zhaogezhuang coal mine;

Analysis on the Factors of the Water-filling in No.3 Coal Seam of Zhaozhuang Coal Mine;