@misc{indiciae77996c4ac596,
  title = {U.S. Geological Survey external quality-assurance project report for the National Atmospheric Deposition Program / National Trends Network and Mercury Deposition Network, 2011-2012},
  author = {Gregory A. Wetherbee and RoseAnn Martin},
  year = {2014},
  url = {https://pubs.usgs.gov/publication/70133137},
  note = {Source identifier: 70133137}
}