@misc{indiciae6b3ca7c89b0f,
  title = {A brief review of the geology of the San Juan region of southwestern Colorado},
  author = {Whitman Cross and Esper S. Larsen},
  year = {1935},
  doi = {10.3133/b843},
  url = {https://pubs.usgs.gov/publication/b843},
  note = {Source identifier: b843}
}