@misc{indiciaeed726ce041b6,
  title = {A 50-year record of NOx and SO2 sources in precipitation in the Northern Rocky Mountains, USA},
  author = {David L. Naftz and Paul F. Schuster and Craig A. Johnson},
  year = {2011},
  doi = {10.1186/1467-4866-12-4},
  url = {https://pubs.usgs.gov/publication/70036071},
  note = {Source identifier: 70036071}
}