@misc{indiciae07c64a4be442,
  title = {Nitrate in Ground Waters of the United States--Assessing the Risk},
  author = {Bernard T. Nolan and Barbara C. Ruddy},
  year = {1998},
  doi = {10.3133/fs09296},
  url = {https://pubs.usgs.gov/publication/fs09296},
  note = {Source identifier: fs09296}
}