@misc{indiciae50fbb76e8373,
  title = {Geologic map of the Portal Quadrangle and vicinity, Cochise County, Southeast Arizona},
  author = {H.D. Drewes and E. A. Du Bray and J.S. Pallister},
  year = {1995},
  doi = {10.3133/i2450},
  url = {https://pubs.usgs.gov/publication/i2450},
  note = {Source identifier: i2450}
}