@misc{indiciae0e8c6314ee4f,
  title = {Geochemical exploration techniques based on distribution of selected elements in rocks, soils, and plants, Vekol porphyry copper deposit area, Pinal County, Arizona},
  author = {Maurice A. Chaffee},
  year = {1977},
  doi = {10.3133/b1278e},
  url = {https://pubs.usgs.gov/publication/b1278E},
  note = {Source identifier: b1278E}
}