@misc{indiciae0ad3a5fea98f,
  title = {[Fourth Annual] Preliminary Report of the United States Geological Survey of Wyoming and portions of contiguous Territories (being a second annual report of progress)},
  author = {Ferdinand Vandeveer Hayden},
  year = {1871},
  doi = {10.3133/70038926},
  url = {https://pubs.usgs.gov/publication/70038926},
  note = {Source identifier: 70038926}
}