@misc{indiciae9ad09d1dfbd7,
  title = {Surficial geologic map of the Mammoth Quadrangle and part of the Gardiner Quadrangle, Yellowstone National Park, Wyoming and Montana},
  author = {K. L. Pierce},
  year = {1973},
  doi = {10.3133/i641},
  url = {https://pubs.usgs.gov/publication/i641},
  note = {Source identifier: i641}
}