@misc{indiciae6aecf50b82c2,
  title = {Distribution of silver and copper in placer gold derived from the northeastern part of the Colorado Mineral Belt},
  author = {George A. Desborough and William H. Raymond and Paula J. Iagmin},
  year = {1970},
  doi = {10.2113/gsecongeo.65.8.937},
  url = {https://pubs.usgs.gov/publication/70226166},
  note = {Source identifier: 70226166}
}