@misc{indiciae9ede972bad2d,
  title = {Coal quality trends and distribution of potentially hazardous trace elements in eastern Kentucky coals},
  author = {C.F. Eble and J.C. Hower},
  year = {1997},
  doi = {10.1016/s0016-2361(96)00191-3},
  url = {https://pubs.usgs.gov/publication/70019798},
  note = {Source identifier: 70019798}
}