@misc{indiciae75d57ac43b4c,
  title = {Map showing potential for copper deposits in the eastern three-quarters of the Nogales 2° quadrangle, Tucson area, Arizona},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1973},
  doi = {10.3133/i844g},
  url = {https://pubs.usgs.gov/publication/i844G},
  note = {Source identifier: i844G}
}