@misc{indiciaecb4f47b8b617,
  title = {Geologic map of the El Capitan Mountain quadrangle, Gila and Pinal counties, Arizona},
  author = {Henry Rowland Cornwall and Medora Louise Hooper Krieger},
  year = {1978},
  doi = {10.3133/gq1442},
  url = {https://pubs.usgs.gov/publication/gq1442},
  note = {Source identifier: gq1442}
}