@misc{indiciaec85eb1ae5ca0,
  title = {Manganese and iron deposits of Morro do Urucum, Mato Grosso, Brazil},
  author = {John Van N. Dorr},
  year = {1945},
  doi = {10.3133/b946a},
  url = {https://pubs.usgs.gov/publication/b946A},
  note = {Source identifier: b946A}
}