@misc{indiciae6ae1cbe2b874,
  title = {Hardpan soils of the coastal plain of southern Maryland},
  author = {C.C. Nikiforoff},
  year = {1955},
  doi = {10.3133/pp267b},
  url = {https://pubs.usgs.gov/publication/pp267B},
  note = {Source identifier: pp267B}
}