@misc{indiciaeb8897c46986f,
  title = {Origin and significance of natural gases of Montana},
  author = {Dudley D. Rice},
  year = {1975},
  doi = {10.3133/ofr75188},
  url = {https://pubs.usgs.gov/publication/ofr75188},
  note = {Source identifier: ofr75188}
}