@misc{indiciae44d759fc72ed,
  title = {Plays for assessment in Region IV, Rocky Mountains and Northern Great Plains as of October 4, 1993; 1995 National Assessment of oil and gas},
  author = {D. L. Gautier and K. L. Varnes},
  year = {1993},
  doi = {10.3133/ofr93596d},
  url = {https://pubs.usgs.gov/publication/ofr93596D},
  note = {Source identifier: ofr93596D}
}