@misc{indiciae2ca5d56b503b,
  title = {Igneous rocks and related mineral deposits of the Barker Quadrangle, Little Belt Mountains, Montana},
  author = {Irving Jerome Witkind},
  year = {1973},
  doi = {10.3133/pp752},
  url = {https://pubs.usgs.gov/publication/pp752},
  note = {Source identifier: pp752}
}