@misc{indiciae4ec27c986ded,
  title = {Geologic map of the Coburn Mountain quadrangle, Lewis and Clark and Cascade Counties, Montana},
  author = {Robert George Schmidt},
  year = {1972},
  doi = {10.3133/gq975},
  url = {https://pubs.usgs.gov/publication/gq975},
  note = {Source identifier: gq975}
}