@misc{indiciaef0e86c79d532,
  title = {Topics in coal geochemistry—Short course},
  author = {Allan Kolker},
  year = {2018},
  doi = {10.3133/ofr20181145},
  url = {https://pubs.usgs.gov/publication/ofr20181145},
  note = {Source identifier: ofr20181145}
}