@misc{indiciae3de74748f365,
  title = {Distribution of trace elements in coal from the Powhatan No. 6 mine, Ohio},
  author = {C.A. Palmer and R.H. Filby},
  year = {1984},
  doi = {10.1016/0016-2361(84)90007-3},
  url = {https://pubs.usgs.gov/publication/70013164},
  note = {Source identifier: 70013164}
}