@misc{indiciaea0167f5834a4,
  title = {Mesozoic stratigraphy of the Sierrita Mountains, Pima County, Arizona},
  author = {John Roberts Cooper},
  year = {1971},
  doi = {10.3133/pp658d},
  url = {https://pubs.usgs.gov/publication/pp658D},
  note = {Source identifier: pp658D}
}