@misc{indiciae444a9dd50647,
  title = {Geology of contaminants in coal; Phase I, report of investigations},
  author = {C. B. Cecil and R.W. Stanton and F.T. Dulong},
  year = {1981},
  doi = {10.3133/ofr81953a},
  url = {https://pubs.usgs.gov/publication/ofr81953A},
  note = {Source identifier: ofr81953A}
}