@misc{indiciaeca0af298a9a3,
  title = {Oil-shales},
  author = {D. E. Winchester},
  year = {1919},
  doi = {10.1016/s0016-0032(19)90531-x},
  url = {https://pubs.usgs.gov/publication/70009932},
  note = {Source identifier: 70009932}
}