@misc{indiciaee216502f2685,
  title = {Stratigraphy of the Upper Cretaceous and lower Tertiary rocks of the Shotgun Butte area, Fremont County, Wyoming},
  author = {William Richard Keefer and Max Lorain Troyer},
  year = {1956},
  doi = {10.3133/oc56},
  url = {https://pubs.usgs.gov/publication/oc56},
  note = {Source identifier: oc56}
}