@misc{indiciae8c4f78a92a19,
  title = {Changes in the chemistry of precipitation in the United States, 1981-1998},
  author = {M.A. Nilles and B.E. Conley},
  year = {2001},
  doi = {10.1023/a:1013889302895},
  url = {https://pubs.usgs.gov/publication/70023032},
  note = {Source identifier: 70023032}
}