@misc{indiciae7dc012fc4e61,
  title = {Decadal-scale changes of nitrate in ground water of the United States, 1988-2004},
  author = {Michael G. Rupert},
  year = {2008},
  doi = {10.2134/jeq2007.0055},
  url = {https://pubs.usgs.gov/publication/70010011},
  note = {Source identifier: 70010011}
}