@misc{indiciae66de69b65c8e,
  title = {Volume IX: A report of the invertebrate Cretaceous and Tertiary fossils of the upper Missouri country},
  author = {Ferdinand Vandeveer Hayden and Fielding Bradford Meek},
  year = {1876},
  doi = {10.3133/70038959},
  url = {https://pubs.usgs.gov/publication/70038959},
  note = {Source identifier: 70038959}
}