@misc{indiciaea9817ff41493,
  title = {Preliminary map showing potential for copper deposits in the east half of the Tuscon 2 degrees Quadrangle, Arizona},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1974},
  doi = {10.3133/ofr74143},
  url = {https://pubs.usgs.gov/publication/ofr74143},
  note = {Source identifier: ofr74143}
}