TY - RPRT TI - Preliminary study on the mode of occurrence of arsenic in high arsenic coals from southwest Guizhou Province AU - Z. Ding AU - B. Zheng AU - Jiahua Zhang AU - H. E. Belkin AU - R. B. Finkelman AU - F. Zhao AU - D. Zhou AU - Y. Zhou AU - C. Chen PY - 1999 DO - 10.1007/bf02877793 UR - https://pubs.usgs.gov/publication/70021212 ID - 70021212 ER -