@misc{indiciae4a362d3d642e,
  title = {The Foraminiferal Genus Orbitolina in North America},
  author = {Raymond Charles Douglass},
  year = {1960},
  doi = {10.3133/pp333},
  url = {https://pubs.usgs.gov/publication/pp333},
  note = {Source identifier: pp333}
}