@misc{indiciae6f32085c13a1,
  title = {Surficial geologic map of the Old Faithful Quadrangle, Yellowstone National Park, Wyoming},
  author = {H.A. Waldrop},
  year = {1975},
  doi = {10.3133/i649},
  url = {https://pubs.usgs.gov/publication/i649},
  note = {Source identifier: i649}
}