@misc{indiciae90a3e3c75358,
  title = {Preliminary geologic map of southwestern part of the Wallace 1:250,000 sheet, Idaho-Montana},
  author = {Jack Edward Harrison},
  year = {1977},
  doi = {10.3133/ofr7733},
  url = {https://pubs.usgs.gov/publication/ofr7733},
  note = {Source identifier: ofr7733}
}