@misc{indiciae13ba7c8764e5,
  title = {Reconnaissance geologic map of the Big Fork-Avon environmental study area, Flathead, Lake, Lewis and Clark, Missoula, and Powell counties, Montana},
  author = {I. J. Witkind and W.M. Weber},
  year = {1982},
  doi = {10.3133/i1380},
  url = {https://pubs.usgs.gov/publication/i1380},
  note = {Source identifier: i1380}
}