@misc{indiciae6d76922f5ab9,
  title = {Engineering geologic conditions at the sinkhole entrance to Logan Cave, Benton County, Arkansas},
  author = {William H. Schulz and Jonathan P. McKenna},
  year = {2004},
  doi = {10.3133/ofr20041357},
  url = {https://pubs.usgs.gov/publication/ofr20041357},
  note = {Source identifier: ofr20041357}
}