Evaluation of Water-Richness and Risk Level of the Sandstone Aquifer in the Roof of the No. 3 Coal Seam in Hancheng Mining Area. - Niu, Chao; Xu, Xin; Dai, Gelian; Liu, Kai; Xiao, Lele; Luo, Shoutao; Qian, Wanxue (Water (20734441), 2025)