@misc{indiciae9b96fbe179db,
  title = {Reconnaissance geologic map of the northern two-thirds of the Avon quadrangle, Lewis and Clark, and Powell Counties, Montana},
  author = {W. Mark Weber and Irving Jerome Witkind},
  year = {1979},
  doi = {10.3133/ofr79437},
  url = {https://pubs.usgs.gov/publication/ofr79437},
  note = {Source identifier: ofr79437}
}