@misc{indiciae57de24acdfc7,
  title = {Map showing appraisal of oil and gas resource potential of RARE II proposed roadless areas in national forests of Colorado},
  author = {Charles W. Spencer and Gordon Dolton},
  year = {1978},
  doi = {10.3133/ofr78955},
  url = {https://pubs.usgs.gov/publication/ofr78955},
  note = {Source identifier: ofr78955}
}