@misc{indiciae9c9db0beb1f8,
  title = {Nonmarine mollusks of Late Cretaceous age from Wyoming, Utah, and Colorado},
  author = {Teng-Chien Yen},
  year = {1954},
  doi = {10.3133/pp254b},
  url = {https://pubs.usgs.gov/publication/pp254B},
  note = {Source identifier: pp254B}
}