@misc{indiciae24f64aff6380,
  title = {Review of rare earth element concentrations in oil shales of the Eocene Green River Formation},
  author = {Justin E. Birdwell},
  year = {2012},
  doi = {10.3133/ofr20121016},
  url = {https://pubs.usgs.gov/publication/ofr20121016},
  note = {Source identifier: ofr20121016}
}