@misc{indiciaed9945ab168c9,
  title = {Geology and ore deposits of the Breckenridge mining district, Colorado},
  author = {T. S. Lovering},
  year = {1934},
  doi = {10.3133/pp176},
  url = {https://pubs.usgs.gov/publication/pp176},
  note = {Source identifier: pp176}
}