@misc{indiciaefe933fdd3dbc,
  title = {Relation of land use to nitrogen concentration in ground water in the Patuxent River basin, Maryland},
  author = {E. R. McFarland},
  year = {1995},
  doi = {10.3133/wri944170},
  url = {https://pubs.usgs.gov/publication/wri944170},
  note = {Source identifier: wri944170}
}