@misc{indiciae0de4ab239701,
  title = {The effects of volcanic ash on the maceral and chemical composition of the C coal bed, Emery Coal Field, Utah},
  author = {Sharon S. Crowley and R.W. Stanton and Thomas A. Ryer},
  year = {1989},
  doi = {10.1016/0146-6380(89)90059-4},
  url = {https://pubs.usgs.gov/publication/70015260},
  note = {Source identifier: 70015260}
}