@misc{indiciae4bab649f42ae,
  title = {Geologic map of the Brandenburg Mountain quadrangle, Pinal County, Arizona},
  author = {Medora Louise Hooper Krieger},
  year = {1968},
  doi = {10.3133/gq668},
  url = {https://pubs.usgs.gov/publication/gq668},
  note = {Source identifier: gq668}
}