@misc{indiciae44476654fb87,
  title = {A geological reconnaissance in northern Idaho and northwestern Montana, with notes on the economic geology},
  author = {Frank Cathcart Calkins and D. F. MacDonald},
  year = {1909},
  doi = {10.3133/b384},
  url = {https://pubs.usgs.gov/publication/b384},
  note = {Source identifier: b384}
}