@misc{indiciae336aa5410f38,
  title = {Coal quality and compositional characteristics of the Upper Freeport coal bed, Pennsylvania, source of the Argonne \#1 Premium Sample},
  author = {B.S. Pierce and R.W. Stanton},
  year = {1990},
  doi = {10.3133/ofr90697},
  url = {https://pubs.usgs.gov/publication/ofr90697},
  note = {Source identifier: ofr90697}
}