@misc{indiciae73a97b7597c5,
  title = {Mississippian and Devonian stratigraphy of northwestern Montana},
  author = {L.L. Sloss and Wilson M. Laird},
  year = {1945},
  doi = {10.3133/oc15},
  url = {https://pubs.usgs.gov/publication/oc15},
  note = {Source identifier: oc15}
}