@misc{indiciae2113d51e5afc,
  title = {Modeling approaches for assessing the risk of nonpoint-source contamination of ground water},
  author = {B. T. Nolan},
  year = {1998},
  doi = {10.3133/ofr98531},
  url = {https://pubs.usgs.gov/publication/ofr98531},
  note = {Source identifier: ofr98531}
}