@misc{indiciae7757e3cd0c4a,
  title = {The Downtown district of Leadville, Colorado},
  author = {Samuel Franklin Emmons and John Duer Irving},
  year = {1907},
  doi = {10.3133/b320},
  url = {https://pubs.usgs.gov/publication/b320},
  note = {Source identifier: b320}
}