@misc{indiciaecc1ea99a345e,
  title = {Oil shale in a producing oil field in California},
  author = {H.W. Hoots},
  year = {1929},
  doi = {10.3133/pp154e},
  url = {https://pubs.usgs.gov/publication/pp154E},
  note = {Source identifier: pp154E}
}