@misc{indiciaef6045560ac4c,
  title = {Preliminary maps and reports released by the Geologic Division and the Conservation Division, 1948},
  author = {Ruth A. Atherton and Jane Titcomb and R.E. Spratt},
  year = {1949},
  doi = {10.3133/cir64},
  url = {https://pubs.usgs.gov/publication/cir64},
  note = {Source identifier: cir64}
}