@misc{indiciaec07f29c14f0c,
  title = {Geologic map of the Mount Trumbull 30' X 60' quadrangle, Mohave and Coconino Counties, northwestern Arizona},
  author = {George H. Billingsley and Jessica L. Wellmeyer},
  year = {2003},
  doi = {10.3133/i2766},
  url = {https://pubs.usgs.gov/publication/i2766},
  note = {Source identifier: i2766}
}