@misc{indiciae4e1f16ec7e35,
  title = {Geologic map of the Alley Spring quadrangle, Shannon County, Missouri},
  author = {David J. Weary and Randall C. Orndorff},
  year = {2012},
  doi = {10.3133/sim3161},
  url = {https://pubs.usgs.gov/publication/sim3161},
  note = {Source identifier: sim3161}
}