@misc{indiciae03eb5a94cca2,
  title = {A field method for the determination of silver in soils and rocks},
  author = {H. M. Nakagawa and H. W. Lakin},
  year = {1965},
  doi = {10.3133/ofr65182},
  url = {https://pubs.usgs.gov/publication/ofr65182},
  note = {Source identifier: ofr65182}
}