@misc{indiciae423a951ade98,
  title = {Statistical data summaries: mineral industries of South American countries},
  author = {Glenn L. Shaffer},
  year = {1977},
  doi = {10.3133/ofr77556},
  url = {https://pubs.usgs.gov/publication/ofr77556},
  note = {Source identifier: ofr77556}
}