@misc{indiciae7027c734cdac,
  title = {Ecology, paleontology, and stratigraphy},
  author = {H. S. Ladd},
  year = {1959},
  doi = {10.1126/science.129.3341.69},
  url = {https://pubs.usgs.gov/publication/70010731},
  note = {Source identifier: 70010731}
}