@misc{indiciae8d4a48380d96,
  title = {Telluride folio, Colorado},
  author = {Whitman Cross and Chester Wells Purington},
  year = {1899},
  doi = {10.3133/gf57},
  url = {https://pubs.usgs.gov/publication/gf57},
  note = {Source identifier: gf57}
}