@misc{indiciaeac73baf04808,
  title = {The search for new mining districts},
  author = {T. B. Nolan},
  year = {1950},
  doi = {10.2113/gsecongeo.45.7.601},
  url = {https://pubs.usgs.gov/publication/70207353},
  note = {Source identifier: 70207353}
}