@misc{indiciae65bf11e5f149,
  title = {Regional patterns of total nitrogen concentrations in the National Rivers and Streams Assessment},
  author = {James M. Omernik and Steven G. Paulsen and Glenn E. Griffith and Marc H. Weber},
  year = {2016},
  doi = {10.2489/jswc.71.3.167},
  url = {https://pubs.usgs.gov/publication/70171438},
  note = {Source identifier: 70171438}
}