@misc{indiciae0854a0b413c3,
  title = {General geology and structural features of the Birmingham red iron ore district, Alabama},
  author = {T.A. Simpson},
  year = {1959},
  doi = {10.3133/ofr59109},
  url = {https://pubs.usgs.gov/publication/ofr59109},
  note = {Source identifier: ofr59109}
}