@misc{indiciae07c4dad95586,
  title = {Geology of the Shotgun Butte area, Fremont County, Wyoming},
  author = {M. L. Troyer and William Richard Keefer},
  year = {1955},
  doi = {10.3133/om172},
  url = {https://pubs.usgs.gov/publication/om172},
  note = {Source identifier: om172}
}