@misc{indiciae184de2897eb1,
  title = {Geologic sampling of the Chiricahua mountains, Arizona},
  author = {E. A. Du Bray},
  year = {1992},
  doi = {10.3133/b2021},
  url = {https://pubs.usgs.gov/publication/b2021},
  note = {Source identifier: b2021}
}