@misc{indiciae9141bc7baeaf,
  title = {The oil and gas geology of the Foraker quadrangle, Osage County, Oklahoma},
  author = {K. C. Heald},
  year = {1917},
  doi = {10.3133/b641b},
  url = {https://pubs.usgs.gov/publication/b641B},
  note = {Source identifier: b641B}
}