@misc{indiciaee916fda521ae,
  title = {Tracing anthropogenic inputs of nitrogen to ecosystems},
  author = {Carol Kendall and Emily M. Elliott and Scott D. Wankel},
  year = {2008},
  doi = {10.1002/9780470691854.ch12},
  url = {https://pubs.usgs.gov/publication/70199116},
  note = {Source identifier: 70199116}
}