@misc{indiciaee2c88216ac91,
  title = {Geologic map of the lower Piceance Creek area, northwestern Colorado},
  author = {W. J. Hail and G. N. Pipiringos},
  year = {1990},
  doi = {10.3133/i1936},
  url = {https://pubs.usgs.gov/publication/i1936},
  note = {Source identifier: i1936}
}