@misc{indiciae2d51a24862e3,
  title = {The Late Cretaceous ammonite Baculites undatus Stephenson in Colorado and New Mexico},
  author = {W. A. Cobban},
  year = {1973},
  url = {https://pubs.usgs.gov/publication/70160822},
  note = {Source identifier: 70160822}
}