@misc{indiciae3b803fe053c4,
  title = {Concentration of gold in natural waters},
  author = {J. B. McHugh},
  year = {1988},
  doi = {10.1016/0375-6742(88)90051-9},
  url = {https://pubs.usgs.gov/publication/70014330},
  note = {Source identifier: 70014330}
}