@misc{indiciaefc190a8cb152,
  title = {Surficial geologic map of the Two Ocean Pass Quadrangle, Yellowstone National Park and adjoining area, Wyoming},
  author = {G.M. Richmond and K. L. Pierce},
  year = {1971},
  doi = {10.3133/i635},
  url = {https://pubs.usgs.gov/publication/i635},
  note = {Source identifier: i635}
}