@misc{indiciaedfbb90839cd7,
  title = {The Nature and Use of Copper Reserve and Resource Data},
  author = {Dennis P. Cox and Nancy A. Wright and George J. Coakley},
  year = {1981},
  doi = {10.3133/pp907f},
  url = {https://pubs.usgs.gov/publication/pp907F},
  note = {Source identifier: pp907F}
}