TY  - RPRT
TI  - Coal quality trends and distribution of potentially hazardous trace elements in eastern Kentucky coals
AU  - C.F. Eble
AU  - J.C. Hower
PY  - 1997
DO  - 10.1016/s0016-2361(96)00191-3
UR  - https://pubs.usgs.gov/publication/70019798
ID  - 70019798
ER  -