@misc{indiciae475463d126bb,
  title = {Geologic map of Montana},
  author = {D. A. Andrews and G.S. Lambert and George W. Stose},
  year = {1944},
  doi = {10.3133/om25},
  url = {https://pubs.usgs.gov/publication/om25},
  note = {Source identifier: om25}
}