@misc{indiciae894e8b96d5c9,
  title = {Preliminary Metallogenic Map of North America: A listing of deposits by commodity},
  author = {Michael P. Lee and Philip White Guild and Paul G. Schruben},
  year = {1987},
  doi = {10.3133/cir858c},
  url = {https://pubs.usgs.gov/publication/cir858C},
  note = {Source identifier: cir858C}
}