@misc{indiciae6be02608d2ea,
  title = {Surficial geologic map of the Frank Island Quadrangle, Yellowstone National Park, Wyoming},
  author = {G.M. Richmond},
  year = {1974},
  doi = {10.3133/i642},
  url = {https://pubs.usgs.gov/publication/i642},
  note = {Source identifier: i642}
}