@misc{indiciae687b30797a40,
  title = {Foraminifers and calcareous nannofossils of Tertiary strata in Maryland and Virginia: A summary},
  author = {T. G. Gibson and Laurel M. Bybell},
  year = {1984},
  url = {https://pubs.usgs.gov/publication/70221678},
  note = {Source identifier: 70221678}
}