@misc{indiciaeeaca39d1a0a0,
  title = {Primary distribution of silver and copper in native gold from six deposits in the Western United States},
  author = {G. A. Desborough and Robert H. Heidel and W. H. Raymond and J. Tripp},
  year = {1971},
  doi = {10.1007/bf00201890},
  url = {https://pubs.usgs.gov/publication/70001516},
  note = {Source identifier: 70001516}
}