@misc{indiciae07dde5f97d47,
  title = {Recurrent Tropidoleptus zones of the Upper Devonian in New York},
  author = {H. S. Williams},
  year = {1913},
  doi = {10.3133/pp79},
  url = {https://pubs.usgs.gov/publication/pp79},
  note = {Source identifier: pp79}
}