@misc{indiciaec2ed86664c33,
  title = {Twentieth Annual report of the United States Geological Survey, 1898-1899: Part III - Precious-metal mining districts},
  author = {Charles D. Walcott},
  year = {1900},
  doi = {10.3133/ar20\_3},
  url = {https://pubs.usgs.gov/publication/ar20\_3},
  note = {Source identifier: ar20\_3}
}