@misc{indiciaefb2f2bd09e75,
  title = {Map showing sand and gravel deposits in the Bigfork-Avon area, Flathead, Lake, Lewis and Clark, Missoula, and Powell counties, Montana},
  author = {I. J. Witkind},
  year = {1995},
  doi = {10.3133/i2446},
  url = {https://pubs.usgs.gov/publication/i2446},
  note = {Source identifier: i2446}
}