@misc{indiciaec8a1e91e0156,
  title = {A review of the geology and petroleum potential of southwest Montana},
  author = {W. J. Perry},
  year = {1990},
  doi = {10.3133/ofr88450r},
  url = {https://pubs.usgs.gov/publication/ofr88450R},
  note = {Source identifier: ofr88450R}
}