@misc{indiciaef8c47c6c296d,
  title = {Estimate of undiscovered copper resources of the world, 2013},
  author = {Kathleen M. Johnson and Jane M. Hammarstrom and Michael L. Zientek and Connie L. Dicken},
  year = {2014},
  doi = {10.3133/fs20143004},
  url = {https://pubs.usgs.gov/publication/fs20143004},
  note = {Source identifier: fs20143004}
}