@misc{indiciae33cf908a1af2,
  title = {Differentiating recalcitrant carbon residues in spent oil shale and source rocks},
  author = {Justin E. Birdwell and Tim E. Ruble and Christopher Laughrey and David Roper and Greg Walker},
  year = {2010},
  url = {https://pubs.usgs.gov/publication/70156776},
  note = {Source identifier: 70156776}
}