@misc{indiciaea1261c60cedc,
  title = {Tests for oil and gas in Montana},
  author = {C. E. Erdmann and N.A. Davis},
  year = {1944},
  doi = {10.3133/ofr4441},
  url = {https://pubs.usgs.gov/publication/ofr4441},
  note = {Source identifier: ofr4441}
}