@misc{indiciae8720f7ae70d5,
  title = {Radiometric ages of igneous rocks from Pima, Santa Cruz, and Cochise counties, southeastern Arizona},
  author = {Richard F. Marvin and T. W. Stern and S. C. Creasey and H. H. Mehnert},
  year = {1973},
  doi = {10.3133/b1379},
  url = {https://pubs.usgs.gov/publication/b1379},
  note = {Source identifier: b1379}
}