@misc{indiciae2d99afddefae,
  title = {Relation of land use to nitrate in the surficial aquifer along the Straight River, north-central Minnesota, 1992-93},
  author = {J. F. Ruhl},
  year = {1996},
  doi = {10.3133/fs09996},
  url = {https://pubs.usgs.gov/publication/fs09996},
  note = {Source identifier: fs09996}
}