@misc{indiciae70c7196a59b5,
  title = {Geologic map of exposed Precambrian rocks, Des Arc NE Quadrangle, Iron and Madison County, southeast Missouri},
  author = {V.M. Brown},
  year = {1988},
  doi = {10.3133/mf2032},
  url = {https://pubs.usgs.gov/publication/mf2032},
  note = {Source identifier: mf2032}
}