@misc{indiciaef3d37af672c7,
  title = {Digital metallogenic data set for North America and South America},
  author = {M. P. Foose},
  year = {1993},
  doi = {10.3133/ofr93328},
  url = {https://pubs.usgs.gov/publication/ofr93328},
  note = {Source identifier: ofr93328}
}