@misc{indiciaeb5531df02a51,
  title = {Nitrogen isotopes as indicators of NOx source contributions to atmospheric nitrate deposition across the midwestern and northeastern United States},
  author = {Emily M. Elliott and Carol Kendall and Scott D. Wankel and Douglas A. Burns and E.W. Boyer and K. Harlin and Daniel J Bain and T.J. Butler},
  year = {2007},
  doi = {10.1021/es070898t},
  url = {https://pubs.usgs.gov/publication/70031339},
  note = {Source identifier: 70031339}
}