@misc{indiciae0c77090c9764,
  title = {Geologic map of the Rocky Reef quadrangle, Cascade County, Montana},
  author = {Kenneth S. Soward},
  year = {1975},
  doi = {10.3133/gq1240},
  url = {https://pubs.usgs.gov/publication/gq1240},
  note = {Source identifier: gq1240}
}