@misc{indiciaed752773038cb,
  title = {Surficial geologic map of the Grassy Lake Reservoir Quadrangle, Yellowstone National Park and adjoining area, Wyoming},
  author = {G.M. Richmond},
  year = {1973},
  doi = {10.3133/i644},
  url = {https://pubs.usgs.gov/publication/i644},
  note = {Source identifier: i644}
}