@misc{indiciae25a9d5eb8e91,
  title = {Geologic map of the Chaffee Quadrangle, Scott and Cape Girardeau counties, Missouri},
  author = {D.H. Amos},
  year = {1981},
  doi = {10.3133/mf1316},
  url = {https://pubs.usgs.gov/publication/mf1316},
  note = {Source identifier: mf1316}
}