@misc{indiciae068723a444d5,
  title = {Chemical composition of atmospheric precipitation in the northeastern United States},
  author = {F.J. Pearson and Donald W. Fisher},
  year = {1971},
  doi = {10.3133/wsp1535p},
  url = {https://pubs.usgs.gov/publication/wsp1535P},
  note = {Source identifier: wsp1535P}
}