@misc{indiciae1c3cc6da6cfb,
  title = {Ektachrome and ektachrome infrared photography of the Twin Buttes area, Arizona},
  author = {John Roberts Cooper},
  year = {1968},
  doi = {10.3133/ofr6864},
  url = {https://pubs.usgs.gov/publication/ofr6864},
  note = {Source identifier: ofr6864}
}