@misc{indiciaee5b3c5bfc15a,
  title = {Some observations that bear on the origin of porphyry copper deposits},
  author = {Norman G. Banks and Norman J. Page},
  year = {1977},
  doi = {10.3133/ofr77127},
  url = {https://pubs.usgs.gov/publication/ofr77127},
  note = {Source identifier: ofr77127}
}