@misc{indiciae9b969f9e5ddd,
  title = {SULFUR CONTENT OF THE COAL RESOURCES OF THE UNITED STATES: CURRENT STATUS.},
  author = {C. B. Cecil and F.T. Dulong},
  year = {1986},
  url = {https://pubs.usgs.gov/publication/70014544},
  note = {Source identifier: 70014544}
}