@misc{indiciae1d38b17846e6,
  title = {Environmentally critical elements in channel and cleaned samples of Illinois coals},
  author = {I. Demir and R.R. Ruch and H.H. Damberger and R.D. Harvey and J.D. Steele and K.K. Ho},
  year = {1998},
  doi = {10.1016/s0016-2361(97)00164-6},
  url = {https://pubs.usgs.gov/publication/70020706},
  note = {Source identifier: 70020706}
}