@misc{indiciae0201c688bd8f,
  title = {Effects of watershed land use on nitrogen concentrations and δ 15 nitrogen in groundwater},
  author = {Marci L. Cole and Kevin D. Kroeger and J.W. McClelland and I. Valiela},
  year = {2006},
  doi = {10.1007/s10533-005-1036-2},
  url = {https://pubs.usgs.gov/publication/70030779},
  note = {Source identifier: 70030779}
}