@misc{indiciae5b5c90a0856b,
  title = {Cenozoic mammal horizons of western North America, with faunal lists of the Tertiary Mammalia of the West},
  author = {Henry Fairfield Osborn and William Diller Matthew},
  year = {1909},
  doi = {10.3133/b361},
  url = {https://pubs.usgs.gov/publication/b361},
  note = {Source identifier: b361}
}