@misc{indiciae29b46652b27b,
  title = {Nitrate in groundwater of the United States, 1991-2003},
  author = {Karen R. Burow and Bernard T. Nolan and Michael G. Rupert and Neil M. Dubrovsky},
  year = {2010},
  doi = {10.1021/es100546y},
  url = {https://pubs.usgs.gov/publication/70007513},
  note = {Source identifier: 70007513}
}