@misc{indiciae43ea56472840,
  title = {Map of Colorado showing dry holes and oil and gas fields},
  author = {F.K. Demok and H.R. Castor and N. Wood Bass},
  year = {1947},
  doi = {10.3133/om73},
  url = {https://pubs.usgs.gov/publication/om73},
  note = {Source identifier: om73}
}