@misc{indiciaed802ec7eb4b0,
  title = {Size and maceral association of pyrite in Illinois coals and their float-sink fractions},
  author = {R.D. Harvey and P.J. DeMaris},
  year = {1987},
  doi = {10.1016/0146-6380(87)90067-2},
  url = {https://pubs.usgs.gov/publication/70014785},
  note = {Source identifier: 70014785}
}