@misc{indiciae1cca5c59d2d5,
  title = {Physiography and glacial geology of western Montana and adjacent areas},
  author = {W. C. Alden},
  year = {1953},
  doi = {10.3133/pp231},
  url = {https://pubs.usgs.gov/publication/pp231},
  note = {Source identifier: pp231}
}