@misc{indiciae1287d9c9f883,
  title = {Geology and ore deposits of the Bonanza mining district, Colorado, with a section on history and production},
  author = {W. S. Burbank and C.W. Henderson},
  year = {1932},
  doi = {10.3133/pp169},
  url = {https://pubs.usgs.gov/publication/pp169},
  note = {Source identifier: pp169}
}