@misc{indiciae7b2e8cf823fd,
  title = {Geologic reconnaissance map of the Bear Mountain and Oakbrush Ridge quadrangles, Hinsdale and Archuleta counties, Colorado},
  author = {W. J. Hail},
  year = {1971},
  doi = {10.3133/ofr71141},
  url = {https://pubs.usgs.gov/publication/ofr71141},
  note = {Source identifier: ofr71141}
}