@misc{indiciae0683ba8a35bc,
  title = {A geochemical study of alluvium-covered copper deposits in Pima County, Arizona},
  author = {Lyman C. Huff and A. P. Marranzino and H. M. Nakagawa},
  year = {1970},
  doi = {10.3133/b1312c},
  url = {https://pubs.usgs.gov/publication/b1312C},
  note = {Source identifier: b1312C}
}