@misc{indiciae13205f517c08,
  title = {Geologic maps of the Leadville drainage tunnel, Colorado},
  author = {Ogden Tweto},
  year = {1951},
  doi = {10.3133/ofr5184},
  url = {https://pubs.usgs.gov/publication/ofr5184},
  note = {Source identifier: ofr5184}
}