@misc{indiciae509fc4ec53de,
  title = {Computer-generated mineral commodity deposit maps},
  author = {Paul G. Schruben and J. Thomas Hanley},
  year = {1983},
  doi = {10.3133/ofr83410},
  url = {https://pubs.usgs.gov/publication/ofr83410},
  note = {Source identifier: ofr83410}
}