@misc{indiciae490bb2c8195f,
  title = {Preliminary geologic map of the Waldron quadrangle and adjacent areas, Scott County, Arkansas},
  author = {John A. Reinemund and Walter Danilchik},
  year = {1957},
  doi = {10.3133/om192},
  url = {https://pubs.usgs.gov/publication/om192},
  note = {Source identifier: om192}
}