@misc{indiciaea7e3a6ff1369,
  title = {Geology of the Cuarenta mercury district, State of Durango, Mexico},
  author = {David Gallagher and Raphael. Perez Siliceo},
  year = {1946},
  doi = {10.3133/b946f},
  url = {https://pubs.usgs.gov/publication/b946F},
  note = {Source identifier: b946F}
}