@misc{indiciaea149d4d4f869,
  title = {Stratigraphic distribution and zonation of Jurassic (Callovian) ammonites in southern Alaska},
  author = {Ralph Willard Imlay},
  year = {1975},
  doi = {10.3133/pp836},
  url = {https://pubs.usgs.gov/publication/pp836},
  note = {Source identifier: pp836}
}