@misc{indiciae63986fa30aea,
  title = {Geology and ore deposits of the Front Range, Colorado},
  author = {T. S. Lovering and E. N. Goddard},
  year = {1950},
  doi = {10.3133/pp223},
  url = {https://pubs.usgs.gov/publication/pp223},
  note = {Source identifier: pp223}
}