@misc{indiciaec50d157bf55a,
  title = {Geologic structure of the northwestern part of the Pawhuska quadrangle, Oklahoma},
  author = {K. C. Heald},
  year = {1919},
  doi = {10.3133/b691c},
  url = {https://pubs.usgs.gov/publication/b691C},
  note = {Source identifier: b691C}
}