@misc{indiciae19108d528489,
  title = {Map showing preliminary base- and precious-metal resource appraisal, Arizona},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1978},
  doi = {10.3133/ofr78860},
  url = {https://pubs.usgs.gov/publication/ofr78860},
  note = {Source identifier: ofr78860}
}