@misc{indiciae02a24146ccde,
  title = {Geology and mineral resources of the Congonhas district, Minas Gerais, Brazil},
  author = {P. W. Guild},
  year = {1957},
  doi = {10.3133/pp290},
  url = {https://pubs.usgs.gov/publication/pp290},
  note = {Source identifier: pp290}
}