@misc{indiciae41de71f63a4c,
  title = {Fossils of the Littleton formation (Lower Devonian) of New Hampshire},
  author = {A. J. Boucot and Robert Arndt},
  year = {1960},
  doi = {10.3133/pp334b},
  url = {https://pubs.usgs.gov/publication/pp334B},
  note = {Source identifier: pp334B}
}