@misc{indiciae26f5ad2e32b6,
  title = {Preliminary geologic map of the Mount Wrightson quadrangle, Santa Cruz and Pima Counties, Arizona},
  author = {Harald Drewes},
  year = {1966},
  doi = {10.3133/ofr6628},
  url = {https://pubs.usgs.gov/publication/ofr6628},
  note = {Source identifier: ofr6628}
}