@misc{indiciae9a4db0c7497a,
  title = {Map showing wells drilled to depths [greater than or equal to] 20,000 feet in the north-central Gulf Coast region},
  author = {Debra K. Higley},
  year = {1992},
  doi = {10.3133/om224c},
  url = {https://pubs.usgs.gov/publication/om224C},
  note = {Source identifier: om224C}
}