@misc{indiciae1d81d39f041e,
  title = {Preliminary geologic map of the Flagstaff 1 degree by two degrees Quadrangle, Arizona},
  author = {George E. Ulrich and R. Hereford and L.D. Nealey and E.W. Wolfe},
  year = {1979},
  doi = {10.3133/ofr79294},
  url = {https://pubs.usgs.gov/publication/ofr79294},
  note = {Source identifier: ofr79294}
}