@misc{indiciae2619d46c72be,
  title = {Nitrogen in the Mississippi Basin--Estimating sources and predicting flux to the Gulf of Mexico},
  author = {Donald A. Goolsby and William A. Battaglin},
  year = {2000},
  doi = {10.3133/fs13500},
  url = {https://pubs.usgs.gov/publication/fs13500},
  note = {Source identifier: fs13500}
}