TY - RPRT TI - Mineralogical and compositional characteristics of Late Permian coals from an area of high lung cancer rate in Xuan Wei, Yunnan, China: Occurrence and origin of quartz and chamosite AU - S. Dai AU - L. Tian AU - C. L. Chou AU - Y. Zhou AU - M. Zhang AU - L. Zhao AU - Jingyuan Wang AU - Z. Yang AU - H. Cao AU - D. Ren PY - 2008 DO - 10.1016/j.coal.2008.09.001 UR - https://pubs.usgs.gov/publication/70032397 ID - 70032397 ER -