@misc{indiciae62c74933eca5,
  title = {Petroleum exploration plays and resource estimates, 1989, onshore United States; Region 7, Mid-Continent},
  year = {1994},
  doi = {10.3133/ofr9424},
  url = {https://pubs.usgs.gov/publication/ofr9424},
  note = {Source identifier: ofr9424}
}