@misc{indiciaeee81a2c9a372,
  title = {Summary of the National Atmospheric Deposition Program/National Trends Network intersite-comparison program, November 1978-November 1989},
  author = {J.D. Gordon and T. C. Willoughby and L.J. Schroder},
  year = {1991},
  doi = {10.3133/wri914061},
  url = {https://pubs.usgs.gov/publication/wri914061},
  note = {Source identifier: wri914061}
}