@misc{indiciae796886045c78,
  title = {Geologic map of the Dougherty asphalt area, Murray County, Oklahoma},
  author = {Joseph M. Gorman and George Marsh Flint},
  year = {1944},
  doi = {10.3133/om15},
  url = {https://pubs.usgs.gov/publication/om15},
  note = {Source identifier: om15}
}