@misc{indiciae58d196c0df87,
  title = {External quality-assurance results for the National Atmospheric Deposition Program/National Trends Network during 1988},
  author = {R.B. See and J.D. Gordon and T. C. Willoughby},
  year = {1990},
  doi = {10.3133/wri904030},
  url = {https://pubs.usgs.gov/publication/wri904030},
  note = {Source identifier: wri904030}
}