@misc{indiciaec5872f7a7ac3,
  title = {Geologic map of the Sahuarita quadrangle, southeast of Tucson, Pima County, Arizona},
  author = {Harald Drewes},
  year = {1971},
  doi = {10.3133/i613},
  url = {https://pubs.usgs.gov/publication/i613},
  note = {Source identifier: i613}
}