@misc{indiciae9e62319ecaef,
  title = {Geologic map of the Cameron quadrangle, Madison County, Montana},
  author = {Jarvis B. Hadley},
  year = {1969},
  doi = {10.3133/gq813},
  url = {https://pubs.usgs.gov/publication/gq813},
  note = {Source identifier: gq813}
}