@misc{indiciae2f05de11cf81,
  title = {Geology and mineral deposits of the Needle Mountains District, southwestern Colorado},
  author = {Leonard J. Schmitt and William H. Raymond},
  year = {1977},
  doi = {10.3133/b1434},
  url = {https://pubs.usgs.gov/publication/b1434},
  note = {Source identifier: b1434}
}