@misc{indiciae61d5b6d5f01e,
  title = {Devonian stratigraphy of central and northwestern Montana},
  author = {L.L. Sloss and Wilson M. Laird},
  year = {1946},
  doi = {10.3133/oc25},
  url = {https://pubs.usgs.gov/publication/oc25},
  note = {Source identifier: oc25}
}