@misc{indiciaea6bb1a35a8df,
  title = {Trends of heavy oil production in California},
  author = {Christopher J. Schenk},
  year = {1991},
  doi = {10.3133/ofr91339},
  url = {https://pubs.usgs.gov/publication/ofr91339},
  note = {Source identifier: ofr91339}
}