@misc{indiciae1847eba52b45,
  title = {Geologic map of the Challis 1° x 2° quadrangle, Idaho},
  author = {F. S. Fisher and D. H. McIntyre and K. M. Johnson},
  year = {1992},
  doi = {10.3133/i1819},
  url = {https://pubs.usgs.gov/publication/i1819},
  note = {Source identifier: i1819}
}