@misc{indiciae7f17cdd5b9b2,
  title = {Geologic map of the Grassy Lake Reservoir quadrangle, Yellowstone National Park and vicinity, Wyoming},
  author = {Robert L. Christiansen},
  year = {1978},
  doi = {10.3133/gq1459},
  url = {https://pubs.usgs.gov/publication/gq1459},
  note = {Source identifier: gq1459}
}