@misc{indiciaea39f0649a106,
  title = {Petroleum exploration plays and resource estimates, 1989, onshore United States},
  author = {Richard B. Powers},
  year = {1993},
  doi = {10.3133/b2034},
  url = {https://pubs.usgs.gov/publication/b2034},
  note = {Source identifier: b2034}
}