@misc{indiciaeedce34653dbd,
  title = {Geology of the Shotgun Butte area, Fremont County, Wyoming},
  author = {William Richard Keefer and M. L. Troyer},
  year = {1964},
  doi = {10.3133/b1157},
  url = {https://pubs.usgs.gov/publication/b1157},
  note = {Source identifier: b1157}
}