@misc{indiciaeb1c37f86ff6b,
  title = {Palynostratigraphy of Cretaceous and Quaternary strata in the Robins Point corehole, Aberdeen Proving Ground, Harford County, Maryland},
  author = {Norman O. Frederiksen and David S. Powars and Alan P. Hoffmeister and Thomas P. Sheehan},
  year = {1997},
  doi = {10.3133/ofr97279},
  url = {https://pubs.usgs.gov/publication/ofr97279},
  note = {Source identifier: ofr97279}
}