@misc{indiciae24794fd03025,
  title = {The relationship of nitrate concentrations in streams to row crop land use in Iowa},
  author = {K. E. Schilling and R.D. Libra},
  year = {2000},
  doi = {10.2134/jeq2000.00472425002900060016x},
  url = {https://pubs.usgs.gov/publication/70022349},
  note = {Source identifier: 70022349}
}