@misc{indiciae7cb6c3d7d832,
  title = {Geology of the Christmas copper mine, Gila County, Arizona},
  author = {N. P. Peterson and R. W. Swanson},
  year = {1956},
  doi = {10.3133/b1027h},
  url = {https://pubs.usgs.gov/publication/b1027H},
  note = {Source identifier: b1027H}
}