@misc{indiciaedd6f411cda84,
  title = {Geochemical exploration techniques based on distribution of selected elements in rocks, soils, and plants, Mineral Butte copper deposit, Pinal County, Arizona},
  author = {Maurice A. Chaffee},
  year = {1976},
  doi = {10.3133/b1278d},
  url = {https://pubs.usgs.gov/publication/b1278D},
  note = {Source identifier: b1278D}
}