@misc{indiciaecb9f5588c304,
  title = {Physiography and Quaternary geology of the San Juan Mountains, Colorado},
  author = {Wallace W. Atwood and Kirtley F. Mather},
  year = {1932},
  doi = {10.3133/pp166},
  url = {https://pubs.usgs.gov/publication/pp166},
  note = {Source identifier: pp166}
}