@misc{indiciaee965b1c3bc95,
  title = {Cannel, boghead, torbanite, oil shale},
  author = {James Morton Schopf},
  year = {1949},
  doi = {10.2113/gsecongeo.44.1.68},
  url = {https://pubs.usgs.gov/publication/70215623},
  note = {Source identifier: 70215623}
}