@misc{indiciae95c293e3e0a7,
  title = {Geologic map of the Pretty Prairie quadrangle, Lewis and Clark County, Montana},
  author = {Melville Rhodes Mudge},
  year = {1966},
  doi = {10.3133/gq454},
  url = {https://pubs.usgs.gov/publication/gq454},
  note = {Source identifier: gq454}
}