@misc{indiciae1bc47a9b0ced,
  title = {Oil and gas possibilities of the plains adjacent to the Little Rocky Mountains, Montana},
  author = {Maxwell McMichael Knechtel},
  year = {1944},
  doi = {10.3133/om4},
  url = {https://pubs.usgs.gov/publication/om4},
  note = {Source identifier: om4}
}