@misc{indiciae63f3747361f7,
  title = {Economic geology of the Central City district, Gilpin County, Colorado},
  author = {P.K. Sims and Avery A. Drake and E. W. Tooker},
  year = {1963},
  doi = {10.3133/pp359},
  url = {https://pubs.usgs.gov/publication/pp359},
  note = {Source identifier: pp359}
}