@misc{indiciae5b3dd4c72f09,
  title = {Geologic map of the West Thumb quadrangle, Yellowstone National Park, Wyoming},
  author = {Robert L. Christiansen},
  year = {1974},
  doi = {10.3133/gq1191},
  url = {https://pubs.usgs.gov/publication/gq1191},
  note = {Source identifier: gq1191}
}