@misc{indiciaee7643ac62b4c,
  title = {Geologic map of the Littlefield 30' x 60' quadrangle, Mohave County, northwestern Arizona},
  author = {George H. Billingsley and Jeremiah B. Workman},
  year = {2000},
  doi = {10.3133/i2628},
  url = {https://pubs.usgs.gov/publication/i2628},
  note = {Source identifier: i2628}
}