@misc{indiciae1e840855787b,
  title = {Petroleum potential of wilderness lands in Montana},
  author = {William J. Perry and Dudley D. Rice and Edwin K. Maughan},
  year = {1983},
  doi = {10.3133/cir902g},
  url = {https://pubs.usgs.gov/publication/cir902G},
  note = {Source identifier: cir902G}
}