@misc{indiciae5f0eaf591011,
  title = {Interpretive geologic map of Mt. Ajo Quadrangle, Organ Pipe Cactus National Monument, Arizona},
  author = {Janet L. Brown},
  year = {1992},
  doi = {10.3133/ofr9223},
  url = {https://pubs.usgs.gov/publication/ofr9223},
  note = {Source identifier: ofr9223}
}