@misc{indiciae476391b3d62e,
  title = {Oil-shale resource investigations of the U.S. Geological Survey},
  author = {John R. Donnell},
  year = {1977},
  doi = {10.3133/ofr77637},
  url = {https://pubs.usgs.gov/publication/ofr77637},
  note = {Source identifier: ofr77637}
}