@misc{indiciae83c8b7af4c06,
  title = {Geologic map and sections of the Rincon Valley Quadrangle, Pima County, Arizona},
  author = {Harald Drewes},
  year = {1977},
  doi = {10.3133/i997},
  url = {https://pubs.usgs.gov/publication/i997},
  note = {Source identifier: i997}
}