@misc{indiciaedfb7a89c47f0,
  title = {Geology of the Castle Mountain mining district, Montana},
  author = {Walter Harvey Weed and Louis V. Pirsson},
  year = {1896},
  doi = {10.3133/b139},
  url = {https://pubs.usgs.gov/publication/b139},
  note = {Source identifier: b139}
}