@misc{indiciae4637aa2d64a3,
  title = {Distribution of gold in igneous rocks},
  author = {David Gottfried and Jack James Rowe and Robert I. Tilling},
  year = {1972},
  doi = {10.3133/pp727},
  url = {https://pubs.usgs.gov/publication/pp727},
  note = {Source identifier: pp727}
}