@misc{indiciaead565340da31,
  title = {Oil-shale assays on Grand Mesa, west-central Colorado},
  author = {John R. Donnell},
  year = {1972},
  doi = {10.3133/ofr7293},
  url = {https://pubs.usgs.gov/publication/ofr7293},
  note = {Source identifier: ofr7293}
}