@misc{indiciaef31ec896f61e,
  title = {The association of Middle Cambrian rocks and gold deposits in southwest Montana},
  author = {E. T. Ruppel},
  year = {1985},
  doi = {10.3133/ofr85207},
  url = {https://pubs.usgs.gov/publication/ofr85207},
  note = {Source identifier: ofr85207}
}