@misc{indiciae5e16f746b151,
  title = {Reconnaissance geologic map of the west side of the Sierrita Mountains, Palo Alto Ranch Quadrangle, Pima County, Arizona},
  author = {Harald Drewes and J.R. Cooper},
  year = {1973},
  doi = {10.3133/mf538},
  url = {https://pubs.usgs.gov/publication/mf538},
  note = {Source identifier: mf538}
}