@misc{indiciae060f8b453b5c,
  title = {Map showing surficial geology of the St. Louis 30 x 60 minute Quadrangle},
  author = {A. P. Schultz},
  year = {1993},
  doi = {10.3133/ofr93288},
  url = {https://pubs.usgs.gov/publication/ofr93288},
  note = {Source identifier: ofr93288}
}