@misc{indiciaec4d305254ebb,
  title = {Preliminary report on oil-shale resources of Piceance Creek basin, northwestern Colorado},
  author = {John R. Donnell},
  year = {1957},
  doi = {10.3133/b1042h},
  url = {https://pubs.usgs.gov/publication/b1042H},
  note = {Source identifier: b1042H}
}