@misc{indiciaee613040c736e,
  title = {Mineral deposits of the territory of Amapa, Brazil - alluvial gold, cassiterite, and columbite-tantalite in the Ampari River region},
  author = {Montis Ruhl Klepper and Victor Dequech},
  year = {1967},
  doi = {10.3133/ofr67130},
  url = {https://pubs.usgs.gov/publication/ofr67130},
  note = {Source identifier: ofr67130}
}