@misc{indiciaef6d1afd2a4f1,
  title = {USGS ensures quality of acid rain network},
  author = {Mark A. Nilles and John D. Gordon},
  year = {1995},
  doi = {10.3133/fs18295},
  url = {https://pubs.usgs.gov/publication/fs18295},
  note = {Source identifier: fs18295}
}