@misc{indiciaee1da10f95050,
  title = {Map of Montana showing oil and gas fields and test wells for oil and gas},
  author = {James David Vine and Charles Edgar Erdmann and Howard R. Revised by Smith},
  year = {1952},
  doi = {10.3133/om170},
  url = {https://pubs.usgs.gov/publication/om170},
  note = {Source identifier: om170}
}