@misc{indiciae2ff6476c501e,
  title = {Preliminary map showing potential for copper deposits in the Tucson 2° quadrangle, Arizona},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1976},
  doi = {10.3133/ofr76458},
  url = {https://pubs.usgs.gov/publication/ofr76458},
  note = {Source identifier: ofr76458}
}