@misc{indiciaec112e338f622,
  title = {Water-table, surface-drainage, and engineering soils map of the Smyrna area, Delaware},
  author = {Durward H. Boggess and John K. Adams and Christian F. Davis},
  year = {1964},
  doi = {10.3133/ha81},
  url = {https://pubs.usgs.gov/publication/ha81},
  note = {Source identifier: ha81}
}