@misc{indiciae7165ad11641f,
  title = {Photogeologic map of the Agathla Peak 4 quadrangle, Navajo County, Arizona},
  author = {Robert J. Hackman},
  year = {1952},
  doi = {10.3133/ofr5257},
  url = {https://pubs.usgs.gov/publication/ofr5257},
  note = {Source identifier: ofr5257}
}