@misc{indiciaeff03ef1b3c0c,
  title = {The Parsonsburg Sand in the central Delmarva Peninsula, Maryland and Delaware},
  author = {Charles Storrow Denny and J. P. Owens and L.A. Sirkin and Meyer Rubin},
  year = {1979},
  doi = {10.3133/pp1067b},
  url = {https://pubs.usgs.gov/publication/pp1067B},
  note = {Source identifier: pp1067B}
}