@misc{indiciae2fbf1997b7ce,
  title = {Preliminary map of the geology of the area south of Telluride, Colorado},
  author = {John Stewart Vhay},
  year = {1949},
  doi = {10.3133/ofr4952},
  url = {https://pubs.usgs.gov/publication/ofr4952},
  note = {Source identifier: ofr4952}
}