@misc{indiciae24bb9b1e0e3f,
  title = {Some middle Cenomanian (Upper Cretaceous) acanthoceratid ammonites from the Western Interior of the United States},
  author = {W. A. Cobban},
  year = {1987},
  doi = {10.3133/pp1445},
  url = {https://pubs.usgs.gov/publication/pp1445},
  note = {Source identifier: pp1445}
}