@misc{indiciae7af44b8a8eb8,
  title = {Geologic map of the Big Sheep Mountain Quadrangle, Prairie County, Montana},
  author = {R. B. Colton and J. P. McGraw and D. K. Bozeman},
  year = {1994},
  doi = {10.3133/ofr93529},
  url = {https://pubs.usgs.gov/publication/ofr93529},
  note = {Source identifier: ofr93529}
}