@misc{indiciae5ebb2a737631,
  title = {Water-quality assessment of the Delmarva Peninsula, Delaware, Maryland, and Virginia--Effects of agricultural activities on, and distribution of, nitrate and other inorganic constituents in the surficial aquifer},
  author = {P. A. Hamilton and J. M. Denver and P. J. Phillips and R. J. Shedlock},
  year = {1993},
  doi = {10.3133/ofr9340},
  url = {https://pubs.usgs.gov/publication/ofr9340},
  note = {Source identifier: ofr9340}
}