@misc{indiciae528542b90d54,
  title = {Geology and mineral resources of the St. Louis quadrangle, Missouri-Illinois},
  author = {Nevin M. Fenneman},
  year = {1911},
  doi = {10.3133/b438},
  url = {https://pubs.usgs.gov/publication/b438},
  note = {Source identifier: b438}
}