@misc{indiciaeb879f3eeb88f,
  title = {Geology of the Bighorn Canyon-Hardin area, Montana and Wyoming},
  author = {Paul W. Richards},
  year = {1955},
  doi = {10.3133/b1026},
  url = {https://pubs.usgs.gov/publication/b1026},
  note = {Source identifier: b1026}
}