@misc{indiciae0c138015097a,
  title = {Programs and analytical methods for the US Geological Survey Acid Rain Quality-Assurance Project},
  author = {R.B. See and T. C. Willoughby and M. H. Brooks and J.D. Gordon},
  year = {1990},
  doi = {10.3133/wri904029},
  url = {https://pubs.usgs.gov/publication/wri904029},
  note = {Source identifier: wri904029}
}