@misc{indiciae491ea38f0a66,
  title = {Petrography and petrology of Smoky Butte intrusives, Garfield County, Montana},
  author = {Robert E. Matson},
  year = {1960},
  doi = {10.3133/ofr6096},
  url = {https://pubs.usgs.gov/publication/ofr6096},
  note = {Source identifier: ofr6096}
}