@misc{indiciae51353b4d8e15,
  title = {Nitrate Loads and Concentrations in Surface-Water Base Flow and Shallow Groundwater for Selected Basins in the United States, Water Years 1990-2006},
  author = {Norman E. Spahr and Neil M. Dubrovsky and JoAnn M. Gronberg and O. Lehn Franke and David M. Wolock},
  year = {2010},
  doi = {10.3133/sir20105098},
  url = {https://pubs.usgs.gov/publication/sir20105098},
  note = {Source identifier: sir20105098}
}