@misc{indiciaec35f4e6550a0,
  title = {Nutrients in ground water and surface water of the United States; an analysis of data through 1992},
  author = {D. K. Mueller and P. A. Hamilton and D.R. Helsel and K.J. Hitt and B. C. Ruddy},
  year = {1995},
  doi = {10.3133/wri954031},
  url = {https://pubs.usgs.gov/publication/wri954031},
  note = {Source identifier: wri954031}
}