@misc{indiciae970ffc3a8f2a,
  title = {Geology and porphyry copper-type alteration-mineralization of igneous rocks at the Christmas Mine, Gila County, Arizona},
  author = {Randolph A. Koski},
  year = {1979},
  doi = {10.3133/ofr79844},
  url = {https://pubs.usgs.gov/publication/ofr79844},
  note = {Source identifier: ofr79844}
}