@misc{indiciae7528d611d851,
  title = {External quality-assurance results for the National Atmospheric Deposition Program and the National Trends Network during 1986},
  author = {Randolph B. See and LeRoy J. Schroder and Timothy C. Willoughby},
  year = {1988},
  doi = {10.3133/wri884007},
  url = {https://pubs.usgs.gov/publication/wri884007},
  note = {Source identifier: wri884007}
}